[fcl-web] fpmimetypes: incorrect loading from Windows registry

When loading known mime types from registry (on Windows) the leading dot should be removed from file extension.

packages/fcl-web/src/base/fpmimetypes.pp:
@@ -266,7 +266,7 @@ procedure TFPMimeTypes.LoadFromRegistry;
          aType:= Reg.ReadString('Content Type');
          Reg.CloseKey;
          if aType<>'' then
-            AddType(aType,Ext);
+            AddType(aType,Copy(Ext,2,MaxInt));
          end;
        end;
      Reg.CloseKey;