Pre-commit: Fix copyright_headers.py to run on all relevant files

It was only running on the first file passed by pre-commit, instead of all.
Fixes compatibility with Windows paths to get the basename.

.pre-commit-config.yaml

@@ -39,10 +39,10 @@ repos:
         entry: python3 misc/scripts/copyright_headers.py
         exclude: |
           (?x)^(
-            tests/python_build.*|
             .*thirdparty.*|
-            .*platform/android/java/lib/src/com.*|
             .*-so_wrap.*|
+            core/math/bvh_.*\.inc$|
+            platform/android/java/lib/src/com.*|
             platform/android/java/lib/src/org/godotengine/godot/gl/GLSurfaceView.*|
             platform/android/java/lib/src/org/godotengine/godot/gl/EGLLogWrapper.*|
             platform/android/java/lib/src/org/godotengine/godot/utils/ProcessPhoenix.*

misc/scripts/copyright_headers.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+import os
 import sys
 
 header = """\
@@ -35,12 +36,15 @@ header = """\
 /**************************************************************************/
 """
 
-fname = sys.argv[1]
+if len(sys.argv) < 2:
+    print("Invalid usage of copyright_headers.py, it should be called with a path to one or multiple files.")
+    sys.exit(1)
+
+for f in sys.argv[1:]:
+    fname = f
 
     # Handle replacing $filename with actual filename and keep alignment
-fsingle = fname.strip()
-if fsingle.find("/") != -1:
-    fsingle = fsingle[fsingle.rfind("/") + 1 :]
+    fsingle = os.path.basename(fname.strip())
     rep_fl = "$filename"
     rep_fi = fsingle
     len_fl = len(rep_fl)