Doxygen: fixed footer path

Author: TheMostDiligent

Doc/doxygen.cfg

@@ -1441,7 +1441,7 @@ HTML_HEADER            =
 # that Doxygen normally uses.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_FOOTER            = Doc\footer.html
+HTML_FOOTER            = Doc/footer.html
 
 # The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
 # sheet that is used by each HTML page. It can be used to fine-tune the look of