Address dumb build error disallowing double--dash in xml comments

Author: fat-tire

src/main/res/values/strings.xml

@@ -159,7 +159,7 @@
     <string name="config_storage_path">Storage Folder Path</string>
     <string name="config_storage_page_hint">Where captured media is stored</string>
 
-    <!-- accepted digits for directory name -- may vary for locale/platform/etc.
+    <!-- accepted digits for directory name - may vary for locale/platform/etc.
          Skipping periods, spaces, and other special characters to keep it simple -->
     <string name="path_chars">0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_/</string>