remove the cfg test that it is not needed

looking at the code, the #[cfg(not(test))] is not needed, so I remove it
because the CI is failing for some reason on the following code path
with rustc 1.63

     Running `rustc --crate-name lightning --edition=2021 lightning/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,link -C opt-level=1 -C lto=off -C embed-bitcode=no -C debuginfo=2 -C debug-assertions=on --test --cfg 'feature="default"' --cfg 'feature="grind_signatures"' --cfg 'feature="std"' -C metadata=7f2d308b97eed1fd -C extra-filename=-7f2d308b97eed1fd --out-dir /home/runner/work/rust-lightning/rust-lightning/target/debug/deps -C incremental=/home/runner/work/rust-lightning/rust-lightning/target/debug/incremental -L dependency=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps --extern bech32=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libbech32-16d69ba236ca57d8.rlib --extern bitcoin=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libbitcoin-eca0fe041fbfc4dc.rlib --extern dnssec_prover=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libdnssec_prover-1dd31ceabfa87dd5.rlib --extern hashbrown=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libhashbrown-d9958110f8162c77.rlib --extern libm=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/liblibm-274dde3847e6cc8d.rlib --extern lightning_invoice=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/liblightning_invoice-56ed15b130ee9288.rlib --extern lightning_macros=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/liblightning_macros-528cdf9e072c4caf.so --extern lightning_types=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/liblightning_types-2a1be369ae37a72c.rlib --extern possiblyrandom=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libpossiblyrandom-5fb85e240a23737f.rlib --extern regex=/home/runner/work/rust-lightning/rust-lightning/target/debug/deps/libregex-187d4eaedfe307ba.rlib -D warnings -L native=/home/runner/work/rust-lightning/rust-lightning/target/debug/build/bitcoinconsensus-9dfaf2ad2edfe5f6/out -L native=/home/runner/work/rust-lightning/rust-lightning/target/debug/build/bitcoinconsensus-9dfaf2ad2edfe5f6/out -L native=/home/runner/work/rust-lightning/rust-lightning/target/debug/build/secp256k1-sys-44754c91469ec6ec/out`
error: constant `MAX_PEER_STORAGE_SIZE` is never used
    --> lightning/src/ln/channelmanager.rs:2882:1
     |
2882 | const MAX_PEER_STORAGE_SIZE: usize = 1024;
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: `-D dead-code` implied by `-D warnings`

error: could not compile `lightning` due to previous error

Signed-off-by: Vincenzo Palazzo <[email protected]>

Author: vincenzopalazzo

lightning/src/ln/channelmanager.rs

@@ -8310,7 +8310,6 @@ This indicates a bug inside LDK. Please report this error at https://github.com/
 			), ChannelId([0; 32])));
 		}
 
-		#[cfg(not(test))]
 		if msg.data.len() > MAX_PEER_STORAGE_SIZE {
 			log_debug!(logger, "Sending warning to peer and ignoring peer storage request from {} as its over 1KiB", log_pubkey!(counterparty_node_id));