Fix pedantic warnings

This only removes extra semicolons

There is now only one warning left here: https://github.com/openframeworks/openFrameworks/blob/b091db2a7618035331e98fa1a22c0f4ab39bb1f3/libs/openFrameworks/types/ofColor.h#L562

```
../../../libs/openFrameworks/types/ofColor.h:567:9: warning: ISO C++ prohibits anonymous structs [-Wpedantic]
```