Project table view does not accept file/folder drop events

**Version and Platform (required):**
- Binary Ninja Version: 5.3.9399

**Bug Description:**
The table view in project browser should accept file and folder drop events

**Steps To Reproduce:**
Please provide all steps required to reproduce the behavior:
1. Open a project
2. Switch to table view
3. Notice that dropping files/folders just tries to open them instead of adding them to the project
