Fix the incorrect result of AccessibilityShortcutStats

Root Cause: ACCESSIBILITY_BUTTON_MODE has different format than
logging's accessibility shortcut_type.

Solution: mapping the result before logging the atom.

Bug: 209009696
Test: m statsd_testdrive && statsd_testdrive 10127
Change-Id: I518d3ccd080f3650c07a0147ed468c87a4dcd285
1 file changed