bitcoin: add Pocket pubkey for payment requests

pocketbitcoin.com will be able to make payment requests, which will be
useful for the Pocket sell feature in the BitBoxApp.

Author: benma

src/rust/bitbox02-rust/src/hww/api/bitcoin/payment_request.rs

@@ -39,10 +39,10 @@ struct Identity {
 }
 
 const IDENTITIES: &[Identity] = &[
-    // Identity {
-    //     name: "PocketBitcoin",
-    //     public_key: b"...",
-    // },
+    Identity {
+        name: "Pocket Bitcoin",
+        public_key: b"\x02\x29\x02\xb4\xed\xe4\x82\xa9\x07\xce\x16\xa1\xc6\x34\x14\x5e\x72\x8f\x1d\xe4\xf2\x49\x04\x3a\x8b\xe4\x7d\xf2\x7d\xb9\x32\x0c\x2c",
+    },
     #[cfg(feature = "testing")]
     Identity {
         name: "Test Merchant",