Handle AUCTeX's new mode naming convention (#41) #153

Job	Run time
test (ubuntu-latest, 27.2, false)	48s
test (ubuntu-latest, 28.2, false)	43s
test (ubuntu-latest, 29.2, false)	49s
test (macos-latest, 27.2, false)	2m 18s
test (macos-latest, 28.2, false)	2m 40s
test (macos-latest, 29.2, false)	2m 17s
test (windows-latest, 27.2, false)	3m 9s
test (windows-latest, 28.2, false)	53s
test (windows-latest, 29.2, false)	1m 6s
test (ubuntu-latest, snapshot, true)	36s
test (macos-latest, snapshot, true)	1m 48s
test (windows-latest, snapshot, true)	48s
	17m 55s

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