revert: "refactor: Remove allow_keys global (#6346)"

src/nvim/message.c

@@ -1146,6 +1146,7 @@ void wait_return(int redraw)
       // Don't do mappings here, we put the character back in the
       // typeahead buffer.
       no_mapping++;
+      allow_keys++;
 
       // Temporarily disable Recording. If Recording is active, the
       // character will be recorded later, since it will be added to the
@@ -1159,6 +1160,7 @@ void wait_return(int redraw)
         got_int = false;
       }
       no_mapping--;
+      allow_keys--;
       reg_recording = save_reg_recording;
       scriptout = save_scriptout;