Minor Python regress fixes (#2030)

* Fix erronous method name

* Uncomment known failures

* Opportunistic improvements

tests/regress/hook_readonly_write_local.py

@@ -23,7 +23,6 @@ def hook_mem_read(uc, access, address, size, value, data):
 
 
 class REP(regress.RegressTest):
-    @regress.unittest.skip('writing to a UC_PROT_READ area will segfault Unicorn')
     def runTest(self):
         mu = Uc(UC_ARCH_X86, UC_MODE_32)