Fix for the GLFW backend when requesting a single video mode, previously causing a crash.
Fix for the GLFW backend when requesting a single video mode, previously causing a crash.

bollu/vispy,jdreaver/vispy,dchilds7/Deysha-Star-Formation,QuLogic/vispy,srinathv/vispy,julienr/vispy,michaelaye/vispy,kkuunnddaannkk/vispy,michaelaye/vispy,kkuunnddaannkk/vispy,jdreaver/vispy,julienr/vispy,kkuunnddaannkk/vispy,Eric89GXL/vispy,bollu/vispy,sh4wn/vispy,ghisvail/vispy,jdreaver/vispy,inclement/vispy,srinathv/vispy,srinathv/vispy,dchilds7/Deysha-Star-Formation,QuLogic/vispy,sh4wn/vispy,bollu/vispy,michaelaye/vispy,dchilds7/Deysha-Star-Formation,sbtlaarzc/vispy,julienr/vispy,jay3sh/vispy,ghisvail/vispy,inclement/vispy,sh4wn/vispy,sbtlaarzc/vispy,ghisvail/vispy,jay3sh/vispy,hronoses/vispy,drufat/vispy,QuLogic/vispy,hronoses/vispy,hronoses/vispy,drufat/vispy,RebeccaWPerry/vispy,sbtlaarzc/vispy,jay3sh/vispy,RebeccaWPerry/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,drufat/vispy,Eric89GXL/vispy,inclement/vispy