[Dexter] Add os.path.normcase(...) transform to test path early.

  When passing a test path, if the path points directly at a file, then
  normcase would not be called on path.

  This would change the expected lower case drive path, on windows, to be
  uppercase. This patch simply calls normcase on the test path at the earliest
  point possible to avoid this issue.

  Reviewers: djtodoro, jmorse

  Differential Revision: https://reviews.llvm.org/D78633

GitOrigin-RevId: bf1cdc2c6c0460b7121ac653c796ef4995b1dfa9
diff --git a/dexter/dex/tools/TestToolBase.py b/dexter/dex/tools/TestToolBase.py
index 7e00fc5..a2d8a90 100644
--- a/dexter/dex/tools/TestToolBase.py
+++ b/dexter/dex/tools/TestToolBase.py
@@ -79,6 +79,7 @@
             raise Error(e)
 
         options.test_path = os.path.abspath(options.test_path)
+        options.test_path = os.path.normcase(options.test_path)
         if not os.path.isfile(options.test_path) and not os.path.isdir(options.test_path):
             raise Error(
                 '<d>could not find test path</> <r>"{}"</>'.format(