test: fix v-on .prevent modifier tests in IE
test: fix v-on .prevent modifier tests in IE

lepture/vue,diermengdierme/vue,seedalpha/vue,karevn/vue,th0r/vue,th0r/vue,Endika/vue,galenyuan/vue,Endika/vue,shupan123/vue-fixed-type,fergaldoyle/vue,karevn/vue,lepture/vue,diermengdierme/vue,shupan123/vue-fixed-type,fergaldoyle/vue,karevn/vue,galenyuan/vue,shupan123/vue-fixed-type,seedalpha/vue,Endika/vue,diermengdierme/vue,galenyuan/vue,fergaldoyle/vue,lepture/vue,th0r/vue,seedalpha/vue