fix modal dialogues closing button style for Bootstrap5 #1093
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Description
In the move to Bootstrap5, some things were left over, this being one of them. The styling of the close button changed, now done by the
btn-close
class.Look & Feel
Open modals from the footer (e.g. "About FlexMeasures") or in the RQ dashboard (e.g. deleting/re-queueing jobs) - the "X" should be on the top right, look good and work.
How to test
The X should not look good before the PR and be wrongly positioned, but with it, it should be okay.