fix(parser): only ignore the first newline in <pre>
fix(parser): only ignore the first newline in <pre>

fix #6146

Jinjiang/vue,optimizely/vue,Ddder-FE/vue,lizhiyao/vue,Jinjiang/vue,cnchanning/vue,Kingwl/vue,Ddder-FE/vue,lizhiyao/vue,Hanks10100/vue,Kingwl/vue,lizhiyao/vue,Hanks10100/vue,Ddder-FE/vue,Kingwl/vue,vuejs/vue,Ddder-FE/vue,lizhiyao/vue,Hanks10100/vue,Jinjiang/vue,KingMario/vue,KingMario/vue,Hanks10100/vue,KingMario/vue,cnchanning/vue,Kingwl/vue,cnchanning/vue,Jinjiang/vue,KingMario/vue,vuejs/vue,vuejs/vue,vuejs/vue