Fix Timeline: Fix overlapping property "display: inline-flex;" styles from .material-icons (quasarframework#2667)

* Redundant classes for placing icons

q-timeline-dot has a display: block

* Fix overlapping property "display: inline-flex;" styles from .material-icons

Author: neiromaster

src/components/timeline/QTimelineEntry.js

@@ -62,7 +62,6 @@ export default {
       }, [
         this.icon
           ? h(QIcon, {
-            staticClass: 'row items-center justify-center',
             props: { name: this.icon }
           })
           : null

src/components/timeline/timeline.ios.styl

@@ -58,6 +58,7 @@
 
 .q-timeline-dot .q-icon
   position absolute
+  display inline-flex
   top 0
   left 0
   right 0

src/components/timeline/timeline.mat.styl

@@ -58,6 +58,7 @@
 
 .q-timeline-dot .q-icon
   position absolute
+  display inline-flex
   top 0
   left 0
   right 0