[XLA:GPU] Reenable dot_algorithm_support_test in OSS
[XLA:GPU] Reenable dot_algorithm_support_test in OSS

Removed the ConvertGenerator usage which caused a build error in some OSS configs.

(I just noticed that someone disabled this previously.)

Reverts 9ca5a013eca72dfc8f117a7d27a9d53102978a83
