Don't page no service message on MZ signs

[PaulJKim]

Summary of changes

Ad-hoc

Quick fix to prevent double-line paging on MZ signs during LTOTD treatment. This type of double paging causes a bug to occur in the vendor's software which leads to a crash and the signs going blank for some time.

[github-actions]

Coverage of commit 2382fc3

Summary coverage rate:
  lines......: 71.7% (1941 of 2708 lines)
  functions..: 74.3% (545 of 734 functions)
  branches...: no data found

Files changed coverage rate:
                                                             |Lines       |Functions  |Branches    
  Filename                                                   |Rate     Num|Rate    Num|Rate     Num
  =================================================================================================
  lib/content/message/last_trip/no_service.ex                |80.0%      5|50.0%     4|    -      0
  lib/signs/utilities/last_trip.ex                           |87.8%     41| 100%     5|    -      0

Download coverage report

[cmaddox5]

Makes sense to me.