bitcoin-wallet tool: Drop libbitcoin_server.a dependency

This ensures wallet code doesn't access node global state, avoiding bugs like
bitcoin/bitcoin#15557 (comment)

Author: ryanofsky

src/Makefile.am

@@ -593,7 +593,6 @@ endif
 bitcoin_wallet_LDADD = \
   $(LIBBITCOIN_WALLET_TOOL) \
   $(LIBBITCOIN_WALLET) \
-  $(LIBBITCOIN_SERVER) \
   $(LIBBITCOIN_COMMON) \
   $(LIBBITCOIN_CONSENSUS) \
   $(LIBBITCOIN_UTIL) \