py: Reformat all Python files consistently

This commit is the unmodified results of running
```
black $(git ls-files '*.py')
```
with black version 19.10b0. See #2046.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

gio/gio-querymodules-wrapper.py

@@ -4,6 +4,6 @@ import os
 import subprocess
 import sys
 
-if not os.environ.get('DESTDIR'):
-  print('GIO module cache creation...')
-  subprocess.call([sys.argv[1], sys.argv[2]])
+if not os.environ.get("DESTDIR"):
+    print("GIO module cache creation...")
+    subprocess.call([sys.argv[1], sys.argv[2]])