Sequencer- New takes will not respect project setting take number if initial asset doesn't have a shot number

With 5.2, we allowed the take separator to be multiple characters long. But it would appear that when using this feature, if you don't also have a 'shot number' before the take separator, then the new take won't be named correctly. A shot number will be inserted, and the new take number won't format with the correct project setting number of take digits. This works correctly however when using a single character take separator or when having a shot number of any kind.

e.g. with a take separator of '_tk'

Shot_tk001 -> Shot1_tk2 (wrong)

Shot1_tk001 -> Shot1_tk002 (correct)

with a take separator of '_'

Shot_001 -> Shot_002 (correct)

Steps to Reproduce

• set Take Num Digits to "3" and Take Separator to "_tk" in the Project Settings.
• create a main Level Sequence. Call it whatever.. in example "mainSeq".
• create a LevelSequence called "myShot_tk001" and add it to the main LS as a shot in a shot track.
• create a new take of that shot... it will call it "myShot1_tk2"

now create a LevelSequence called "myShot42_tk001" and add that to the main sequence.

if you create a take now, it will name it correctly "myShot42_tk002".