Bug 1275672 - Remove accidental trailing /D from makecab.exe arguments; r=me

This was causing the "path" argument to get swallowed because makecab.exe
thought it was the argument to /D. Derp.

MozReview-Commit-ID: 6Bd3l7ISsPj

--HG--
extra : rebase_source : fbba4e8aff9a164aa10278de08de67c3f38cdf58

toolkit/crashreporter/tools/symbolstore.py

@@ -785,7 +785,7 @@ class Dumper_Win32(Dumper):
             compressed_file = path[:-1] + '_'
             # ignore makecab's output
             success = subprocess.call(["makecab.exe", "/D",
-                                       "CompressionType=MSZIP", "/D",
+                                       "CompressionType=MSZIP",
                                        path, compressed_file],
                                       stdout=open(os.devnull, 'w'),
                                       stderr=subprocess.STDOUT)