[OoT] Fix Cutscene Main obj empty type upgrade issues

[Yanis002]

found this while doing some export tests, there was 2 issues:

1. the call of the upgrade function was in the wrong if block, this made it impossible to reach
2. the upgrade code did not account for the new enum data that was introduced recently, so it was shifting the enum index for no reasons

I addressed these issues with the following changes:

• for issue 1. I simply moved the if statement in the correct block
• for issue 2. I removed the shifting, I moved the "custom" enum value +1 after the value checks and I updated the exclusion list to exclude the unimplemented values (it raises an index error and default to "custom" to keep the previous data)

I made an addition to that, I added a check for the unlikely case where the values are fine (so no index error raised) but it's out of the range of the enum list, if this case happens it should raise a plugin error showing which prop (with the new name) failed (the condition is set to True if it's reaching the except block when it sets custom values)