Correct Magnification shortcut title in edit shortcut dialog

Root Cause: Magnification has its own edit shortcut dialog, but we did not
update correct title with getShortcutTitle()

Solution: set dialog title to getShortcutTitle()

Bug: 231531313
Test: manual test
Change-Id: I0679be2807a4b1f8b8a733604e16a35b0a1258c3
1 file changed