Describe the bug
After scanning, trying to close the results tab gives an error.

To Reproduce
Steps to reproduce the behavior:

1. Scan some directories
2. Click on close button on search result tab
3. See error

Expected behavior
Results tab should close and focus should go to other tab.

Desktop (please complete the following information):

• OS: Linux Mint 19.3 Tricia

Additional context
Error Report:

Application Name: dupeGuru
Version: 4.0.4

Traceback (most recent call last):
File "/home/ulimited/Desktop/0 Comp Sci Related/dupeguru-github/qt/tabbed_window.py", line 222, in onTabCloseRequested
self.setTabVisible(index, False)
File "/home/ulimited/Desktop/0 Comp Sci Related/dupeguru-github/qt/tabbed_window.py", line 181, in setTabVisible
return self.tabWidget.setTabVisible(index, value)
AttributeError: 'QTabWidget' object has no attribute 'setTabVisible'