bugfix: 12hr clock and settings menu

[ruthsarian]

WOPR_Display_V2 bugfixes:

• 12 hour clock mode the hour was displaying the hour as "0" and not "12" at midnight
• removed "NGHT DIM" from settingsStrings[] as the dim at night setting is not implemented; there is no entry for it in enum setings{} which throws off the settings display as it uses the value of currentSetting to index settingsStrings[] to pick what string to display to represent the current setting.

WOPR_Display_V2 code change:

• made use of the ELEMENTS() macro when detecting if the current clock separator setting index is outside the number of available clock separator values rather than using hard-coded values. this makes it easier to add new separators.