Added a performance improvement so we're not adding single river sprites when we don't have to and fixed an error with removing the rounded corner sprite at the bottom of vertical rivers.
Added a performance improvement so we're not adding single river sprites when we don't have to and fixed an error with removing the rounded corner sprite at the bottom of vertical rivers.

nagyistoce/bridges,iOSTestApps/bridges,iOSTestApps/bridges,iOSTestApps/bridges,zgrossbart/bridges,nagyistoce/bridges,zgrossbart/bridges,zgrossbart/bridges,nagyistoce/bridges,nagyistoce/bridges,iOSTestApps/bridges