getUIDAtPadIndex always returns -1, causing tags to disappear on pad sync

[UnDGCat]

I noticed that the disappearing tags problem I thought was caused by the error mentioned in #268 was actually coming from the syncToyPad event's statement (checking if uid != -1) never running. My print statement at line 679 seems to confirm that this is caused by getUIDAtPadIndex always returning -1 regardless of if there was a tag on the pad.

Notably, changing the === operator in the getUIDAtPadIndex function to a == seems to somewhat fix this issue, but instead of disappearing on resync, the tags will duplicate in their pad spots. I suspect this might be related to #270 but I'm keeping this issue open because I'm not experienced enough to figure out whether it truly is related or my solution is just too sloppy and breaks something else.