fix(touchid): add Q key support to quit menu

Allow users to press 'q' or 'Q' to quit the Touch ID setup menu,
in addition to ESC key. This fixes the "Invalid key" error when
users press Q as suggested by the prompt.

Fixes #575

bin/touchid.sh

@@ -292,7 +292,7 @@ show_menu() {
         echo ""
 
         case "$key" in
-            $'\e') # ESC
+            $'\e' | q | Q) # ESC or Q
                 return 0
                 ;;
             "" | $'\n' | $'\r')   # Enter
@@ -310,7 +310,7 @@ show_menu() {
         drain_pending_input # Clean up any escape sequence remnants
 
         case "$key" in
-            $'\e') # ESC
+            $'\e' | q | Q) # ESC or Q
                 return 0
                 ;;
             "" | $'\n' | $'\r')   # Enter