callparticipantsmodel: fix typo

Change-Id: I32e7aa66466108b8ebac8a472a00f9f08e91a3b6

src/libclient/api/callparticipantsmodel.h

@@ -45,7 +45,7 @@ const QString X = "x";
 const QString Y = "y";
 const QString W = "w";
 const QString H = "h";
-const QString WIDTH = "widht";
+const QString WIDTH = "width";
 const QString HEIGHT = "height";
 const QString VIDEOMUTED = "videoMuted";
 const QString AUDIOLOCALMUTED = "audioLocalMuted";