Correct Magnification shortcut title

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

Solution: Call setTitle(getShortcutTitle()) in initShortcutPreference()

Bug: 228752572
Test: manual test
Change-Id: I85b09a22032bad0a0c840590a98be88538a0499b
1 file changed