Fixed method ambiguity for `MALA` #292

Job	Run time
test (1.6, ubuntu-latest, x86)	2m 24s
test (1.6, ubuntu-latest, x64)	2m 1s
test (1.6, macOS-latest, x64)	2m 38s
test (1.6, windows-latest, x86)	7m 1s
test (1.6, windows-latest, x64)	8m 6s
test (1, ubuntu-latest, x86)	2m 21s
test (1, ubuntu-latest, x64)	1m 42s
test (1, macOS-latest, x64)	4m 24s
test (1, windows-latest, x86)	4m 7s
test (1, windows-latest, x64)	2m 27s
test (nightly, ubuntu-latest, x86)	3m 22s
test (nightly, ubuntu-latest, x64)	2m 32s
test (nightly, macOS-latest, x64)	3m 25s
test (nightly, windows-latest, x86)	4m 42s
test (nightly, windows-latest, x64)	3m 41s
	54m 53s

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