gui-init: Remove unneeded UTC time zone indication from current time

The time zone in Heads is always UTC and we mentioned that in the text.
Don't repeat it.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

Author: JonathonHall-Purism

initrd/bin/gui-init

@@ -547,7 +547,7 @@ prompt_totp_mismatch()
 {
   TRACE_FUNC
   if (whiptail_warning --title "TOTP/HOTP code mismatched" \
-    --yesno "TOTP/HOTP code mismatches could indicate TPM tampering or clock drift.\n\nThe current UTC time is: $(date "+%Y-%m-%d %H:%M:%S %Z")\nIf this is incorrect, set the correct time and check TOTP/HOTP again.\n\nDo you want to change the time?" 0 80) then
+    --yesno "TOTP/HOTP code mismatches could indicate TPM tampering or clock drift.\n\nThe current UTC time is: $(date "+%Y-%m-%d %H:%M:%S")\nIf this is incorrect, set the correct time and check TOTP/HOTP again.\n\nDo you want to change the time?" 0 80) then
   		change-time.sh
   fi
 }