Fix redundant segment download when setQualityfor() is invoked many times
requested to merge github/fork/aescarcha/redundantSegmentDownloadWhenChangingQuality into development
Created by: aescarcha
Changed isFragmentLoaded method to ignore the track representation when comparing URL, this caused redundant segment downloads when quality changed.
This comparison was added at https://github.com/Dash-Industry-Forum/dash.js/pull/2252, the logic should still be valid for that case.
Fixes #2434 (closed)