test: put expected assert value in correct place
The order of arguments in test-fs-readdir-ucs2 was the opposite of what is recommended in the documentation, which is that the first value should be the value being tested, and the second value is the expected value. This fixes the test to make it conform to the documentation.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines