[swarming] fix 'root_path' in test_get_disks_info

Make letter 'c' in 'root_path' lowercase in test_get_disks_info in os_utilities_test.py

Bug: 1017545
Change-Id: Icbfcfdeb737f827839bb76e3d57be2e7996d190e
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2817695
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Momo Sasaki <momosasaki@google.com>
diff --git a/appengine/swarming/swarming_bot/api/os_utilities_test.py b/appengine/swarming/swarming_bot/api/os_utilities_test.py
index 54c514f..1d74725 100755
--- a/appengine/swarming/swarming_bot/api/os_utilities_test.py
+++ b/appengine/swarming/swarming_bot/api/os_utilities_test.py
@@ -150,11 +150,10 @@
   def test_get_physical_ram(self):
     self.assertGreater(os_utilities.get_physical_ram(), 0)
 
-  @unittest.skipIf(sys.platform == 'win32', 'TODO(crbug.com/1017545)')
   def test_get_disks_info(self):
     info = os_utilities.get_disks_info()
     self.assertGreater(len(info), 0)
-    root_path = u'C:\\' if sys.platform == 'win32' else u'/'
+    root_path = u'c:\\' if sys.platform == 'win32' else u'/'
     root = info[root_path]
     # Round the same way.
     free_disk = round(