Re-enable dapui.el so I can see loaded sources #595

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 5s
test (ubuntu-latest, 28.2, false)	1m 17s
test (ubuntu-latest, 29.4, false)	1m 54s
test (macos-latest, 28.2, false)	1m 59s
test (macos-latest, 29.4, false)	2m 31s
test (windows-latest, 27.2, false)	2m 44s
test (windows-latest, 28.2, false)	2m 23s
test (windows-latest, 29.4, false)	3m 15s
test (ubuntu-latest, snapshot, true)	56s
test (macos-latest, snapshot, true)	1m 49s
test (windows-latest, snapshot, true)	3m 43s
	23m 36s

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