Clang-format: make regex case sensitive

To avoid confusion between <queue> and Qt includes
Fixes PointCloudLibrary#5212

Author: mvieth

.clang-format

@@ -44,6 +44,7 @@ IncludeCategories:
 # Major 3rd-Party components of apps
   - Regex:           '^<Q[^/]+>$'
     Priority:        300
+    CaseSensitive:   true
   - Regex:           '^<ui_[^/]+\.h>$'
     Priority:        300
   - Regex:           '^<vtk[^/]+\.h>$'