Re-enable dapui.el so I can see loaded sources #593

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 10s
test (ubuntu-latest, 28.2, false)	1m 22s
test (ubuntu-latest, 29.4, false)	3m 5s
test (macos-latest, 28.2, false)	2m 14s
test (macos-latest, 29.4, false)	2m 55s
test (windows-latest, 27.2, false)	3m 36s
test (windows-latest, 28.2, false)	4m 33s
test (windows-latest, 29.4, false)	2m 24s
test (ubuntu-latest, snapshot, true)	55s
test (macos-latest, snapshot, true)	1m 47s
test (windows-latest, snapshot, true)	4m 18s
	28m 19s

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