Use MMRV specific consent reminder

We initially wanted to use the same template for MMR and MMRV reminders,
but the "ABout the <> vaccine" section is specific to the vaccine and
hence needs to be different for MMR and MMRV.

Author: murugapl

config/initializers/govuk_notify.rb

@@ -15,7 +15,7 @@
     "3523d4b8-530b-42dd-8b9b-7fed8d1dfff1",
   consent_school_initial_reminder_flu: "7f85a5b4-5240-4ae9-94f7-43913852943c",
   consent_school_initial_reminder_hpv: "0d78bff0-9dde-4192-8cf8-10e83486b54f",
-  consent_school_initial_reminder_mmr: "fe47875a-a0a6-40d9-bd41-a411ebb31cff",
+  consent_school_initial_reminder_mmr: "5462c441-81c0-4ac0-821f-713b4178f8ba",
   consent_school_initial_reminder_mmrv: "fe47875a-a0a6-40d9-bd41-a411ebb31cff",
   consent_school_request_doubles: "9b1a015d-6caa-47c5-a223-f72377586602",
   consent_school_request_flu: "017853bc-2b35-4aff-99b1-193e514613a0",
@@ -29,7 +29,7 @@
   consent_school_subsequent_reminder_hpv:
     "5f70d21d-00b6-41e6-bdc9-e64455972b43",
   consent_school_subsequent_reminder_mmr:
-    "fe47875a-a0a6-40d9-bd41-a411ebb31cff",
+    "5462c441-81c0-4ac0-821f-713b4178f8ba",
   consent_school_subsequent_reminder_mmrv:
     "fe47875a-a0a6-40d9-bd41-a411ebb31cff",
   consent_unknown_contact_details_warning:
@@ -78,7 +78,6 @@
   "e871e7d5-06be-48d1-81ba-38ddecae46e2" => :consent_confirmation_refused,
   "b9c0c3fb-24f1-4647-a2a1-87389cec9942" => :consent_school_reminder,
   "12f90b2d-33a5-429c-9ed7-0aa2823eb3ac" => :consent_school_request,
-  "5462c441-81c0-4ac0-821f-713b4178f8ba" => :consent_school_reminder_mmr,
   "07516fbf-6d51-4c17-a046-305f5baa6744" => :vaccination_administered_flu,
   "3179b434-4f44-4d47-a8ba-651b58c235fd" => :consent_confirmation_given,
   "eb34f3ab-0c58-4e56-b6b1-2c179270dfc3" => :consent_confirmation_refused,