fix(ios): ensure we don't disable tracks when not necessary #4130
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Summary
fix(ios): ensure we don't disable tracks when not necessary (causing black screen because all tracks because disable)
Motivation
fix: #4037
Changes
There was an index management issue.
When track cannot be loaded, the first track is not available but we anyway consider first track as -1
Test plan
Can be tested with sample by putting an invalid textTrack url