[GTKUI] Fix cairo crashes by not storing current context #431
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Windows users have reported Deluge crashes when resizing the window with Piecesbar or Stats plugins enabled:
This is similar to issues fixed in GNU Radio which is a problem due to storing the current cairo context which is then being destroyed and recreated within GTK causing a reference count error
Fixes: https://dev.deluge-torrent.org/ticket/3339
Refs: gnuradio/gnuradio#6352