[ModuleInterface] Use 2-arg form of basename(1) in overlay validation tests. #19942
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A bunch of .swiftinterface files fail to build into their respective .swiftmodules
if you pass -module-name for some foo that is not the correct module name.
The two tests in this change were using a shell expansion that incorrectly picked
the first path component with a period in the name as the module name; this caused
the failures.
Rather than using a shell expansion, this change uses the 2-argument form of
basename(1) (which is POSIX) that also removes a suffix from the basename.
rdar://45347391