Fix comparison modal behaviour
Bug reported today by Daniel by email
The comparison modal is used to compare two different transcriptions of the same text. One chooses the transcription_levels one wants to compare here:
If I select a transcription here currently it switches the main transcription panel to it. It should NOT do this.
Rather the "transcription panel" should remain on the previously selected choice. Checking the boxes should only influence which texts are compared in the comparison modal, meaning only the two lines (circled in red), those below the line from the currently chosen transcription level (circled in blue): It should only affect the lines encircled in red, not the text in the transcription panel (and not the line encircled in blue, taken from the transcription panel).