tuxtxt: remember current screenmode if exiting from transparent mode

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@1485 e54a6e83-5905-42d5-8d5c-058d10e6a962

lib/libtuxtxt/tuxtxt.cpp

@@ -1811,6 +1811,8 @@ int tuxtx_main(int _rc, int pid, int page, int source)
 		/* update page or timestring and lcd */
 		RenderPage();
 	} while ((RCCode != RC_HOME) && (RCCode != RC_STANDBY));
+	/* if transparent mode was selected, remember the original mode */
+	screenmode = prevscreenmode;
 
 	/* exit */
 	CleanUp();