fix(MdTabs): correct indicator position on transition end

[VdustR]

I tested the case #1432 (comment) I got min-width as the last property on transition end, so I setIndicatorStyles while that transition end.

vue-material/src/components/MdTabs/MdTabs.vue

Line 124 in 3e69486

if (event.propertyName !== 'min-width') {

In this case #1432 (comment), I got flex-grow as the last transition end.

We never know which property is the last transition end, so I think it's better to setIndicatorStyles on every transitionend.

I tried to use transitionstart to implement a counter for checking which property is on the last transition end, but that is an experimental technology.

relate to #1442

fix #1432