Fix-up of PR #11402: Redeem the copyright holders' names for `source/…

…gui/inputGestures.py` after its split from `source/gui/settingsDialogs.py` (#12386)

Fix-up of PR #11402

Summary of the issue:
In PR #11402, part of source/gui/settingsDialogs.py has been extracted to the new source/gui/inputGestures.py for good reasons.
However, in the process, the name of the copyright holders for this portion of the code has not been reported to the header of the new file.

Description of how this pull request fixes the issue:
Copy all the names from the copryright headers in source/gui/settingsDialogs.py.

source/gui/inputGestures.py

@@ -1,6 +1,9 @@
 # -*- coding: UTF-8 -*-
 # A part of NonVisual Desktop Access (NVDA)
-# Copyright (C) 2020 NV Access Limited
+# Copyright (C) 2013-2020 NV Access Limited, Peter Vágner, Aleksey Sadovoy,
+# Rui Batista, Joseph Lee, Heiko Folkerts, Zahari Yurukov, Leonard de Ruijter,
+# Derek Riemer, Babbage B.V., Davy Kager, Ethan Holliger, Bill Dengler, Thomas Stivers
+# Julien Cochuyt, Cyrille Bougot
 # This file is covered by the GNU General Public License.
 # See the file COPYING for more details.