Make suggestions popup insert wrapped emotes

The suggestions popup will now insert wrapped emotes instead of bare
word emotes.  This is so the autocompletion will still work if the
WrappedEmotesOnly setting is set to true.

wasm/suggestions.go

@@ -81,7 +81,7 @@ func processMessageKey(this js.Value, v []js.Value) interface{} {
 				offset = 1
 			}
 
-			newval = newval[:i+offset] + currentSug
+			newval = newval[:i+offset] + ":" + currentSug + ":"
 		}
 
 		endVal := val[startIdx:]