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remove `think_counter` from `gui/gm-unit` #5863

Job	Run time
docs / Build linux64	1m 16s
lint / lint	21s
test / Linux gcc-10 / Build linux64	1m 50s
test / Windows MSVC / Build win64	22m 56s
test / Linux gcc-12 / Build linux64	1m 36s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	48s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	46s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 26s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 15s
	32m 14s

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