Fix for sound not played after resuming widget

Fix for sound not played after resuming widget

[Title] Sound not played after resuming application when clicking play, just after resume.
[Issue] N_SE-51493
[Problem] Suspend method from HTMLMediaElement was causing gstreamer state change to NULL, so that further play trigger was not working
[Solution] Prevent from changing network and ready states when player is suspended, fixed paused method (paused means "not playing" for HTMLMediaElement).
           Add guard for seek method (seek can be performed only when GStreamer is in playing or paused state. Updated suspend time when seeking. When in suspend state suspendTime is returned.

Change-Id: I318221b351ae1b93701ff07200b8d5524831e92f