Fix for broken VS2013 solution filters

Addition of ogg libs broken the VS2013 solution filters. This change
fixes that so the solution explorer shows the filters again.

(Sorry!)

engine/compilers/VisualStudio 2013/Torque 2D.vcxproj.filters

@@ -3164,6 +3164,7 @@
     </ClInclude>
     <ClInclude Include="..\..\source\audio\vorbisStreamSource.h">
       <Filter>audio</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\source\platformWin32\winVersion.h">
       <Filter>platformWin32</Filter>
     </ClInclude>