Relative song paths will now be converted to absolute song paths

Same fix from GaryCXJk for release-0.4.1

Vocaluxe/Base/CConfig.cs

@@ -633,7 +633,7 @@ namespace Vocaluxe.Base
                 {
                     //Check if folder exists
                     if (Directory.Exists(folder))
-                        SongFolders.Add(folder);
+                        SongFolders.Add(Path.GetFullPath(folder));
                 }
             }
             
@@ -803,4 +803,4 @@ namespace Vocaluxe.Base
             }
         }
     }
-}
+}