Fix CppunitTest_sal_osl_profile

Change-Id: Ie66636881a2e4c754bd95f9d1d72e0b4fc2828df
coverity#706154 is about call to strcpy, not osl_ProfileGenerateExtension

...and the call to strcpy isn't even necessary.  This includes a revert of
430237b3fa16bda228ff82b93228f28894568671 "coverity#706154: Dest buffer too
small."

Change-Id: I51186da6e7d80438b01d49e24a1fa47877078516