TagType object leaks

TagType Leak
1. Ensure you're on latest dev with active object counters for TagType and TagReference
2. Open a binary, navigate to the tag type tab in the tags sidebar
3. Close the binary Observe the count (19)
```
>>> get_memory_usage_info()['Active TagType objects']
19
```
5. Redo step 2
6. Close the binary, observe the count (38)
```
>>> get_memory_usage_info()['Active TagType objects']
38
```