Remove testUsdExportEmptyXforms.py change - test relies on plugInfo discovery which is env-specific

Author: dj-mcg

test/lib/usd/translators/testUsdExportEmptyXforms.py

@@ -139,10 +139,7 @@ def _exportToUSD(self, filename, includeEmpties, defaultPrimPath=None):
         '''
         Export to USD, either including or excluding empty Xforms.
         '''
-        cmds.usdExport(file=filename, includeEmptyTransforms=includeEmpties,
-                       defaultPrim=defaultPrimPath, legacyMaterialScope=False,
-                       materialsScopeName='mtl',
-                       chaser=["AddPayloadOrRefChaser"])
+        cmds.usdExport(file=filename, includeEmptyTransforms=includeEmpties, defaultPrim=defaultPrimPath)
 
     def _verifyPrims(self, stage, present = [], absent = []):
         '''