Fix flake8 errors in test_arrows.py
Fix flake8 errors in test_arrows.py

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