revert: restore Example to single-precision skip list (case-sensitive mismatch with example dir names)

Author: sbryngelson

toolchain/mfc/test/test.py

@@ -176,7 +176,7 @@ def __filter(cases_) -> typing.Tuple[typing.List[TestCase], typing.List[TestCase
 
     for case in cases[:]:
         if ARG("single"):
-            skip = ["low_Mach", "Hypoelasticity", "teno", "Chemistry", "Phase Change model 6", "Axisymmetric", "Transducer", "Transducer Array", "Cylindrical", "HLLD"]
+            skip = ["low_Mach", "Hypoelasticity", "teno", "Chemistry", "Phase Change model 6", "Axisymmetric", "Transducer", "Transducer Array", "Cylindrical", "HLLD", "Example"]
             if any(label in case.trace for label in skip):
                 cases.remove(case)
                 skipped_cases.append(case)