[lldb][yaml2macho-core] fix typeo in API test

Author: jasonmolenda

lldb/test/API/macosx/riscv32-corefile/TestRV32MachOCorefile.py

@@ -13,7 +13,7 @@
 class TestRV32MachOCorefile(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
-    @skipunlessDarwin  # windows CI failure, says only 1 thread in corefile
+    @skipUnlessDarwin  # windows CI failure, says only 1 thread in corefile
     @no_debug_info_test
     def test_riscv32_gpr_corefile_registers(self):
         corefile = self.getBuildArtifact("core")