refactor: remove unused PSBTError::Ok

src/common/messages.cpp

@@ -118,8 +118,6 @@ bilingual_str PSBTErrorString(PSBTError err)
             return Untranslated("Input needs additional signatures or other data");
         case PSBTError::INVALID_TX:
             return Untranslated("The transaction cannot be valid");
-        case PSBTError::OK:
-            return Untranslated("No errors");
     } // no default case, so the compiler can warn about missing cases
     assert(false);
 }

src/common/types.h

@@ -24,7 +24,6 @@ enum class PSBTError {
     UNSUPPORTED,
     INCOMPLETE,
     INVALID_TX,
-    OK,
 };
 /**
  * Instructions for how a PSBT should be signed or filled with information.