Fix for Loop indefinite overrides

[bjorkert]

This PR fixes a regression introduced in #400, where indefinite overrides created by Loop were incorrectly displayed as 5-minute events until they ended. Once terminated, they were updated with the correct duration and rendered properly.

With this fix, indefinite overrides are now shown correctly from the start.

[marionbarker]

Test

Confirm the problem

Configure a test phone to upload to NS and be followed using LoopFollow 2.5.0

• Issue an indefinite override on the Loop phone
• Wait at least one loop cycle for NS to update
  • Observe that the indefinite override shows up as 5 minutes extent while running
• Cancel the override on the Loop phone
  • Observe that after canceling the override, the extent shown is the actual time it was engaged

Confirm this PR works as expected

Configure a test phone to upload to NS and be followed using this branch

• Issue an indefinite override on the Loop phone
• Wait at least one loop cycle for NS to update
  • Observe that the indefinite override shows up indefinite - watch for a few more cycles
• Cancel the override on the Loop phone after 42 minutes
  • Observe that after canceling the override, the extent shown is the actual time it was engaged

[marionbarker]

Approve from code review and test