[slices axis] fix axis spacing on dashboard and explore slices (#2145)
[slices axis] fix axis spacing on dashboard and explore slices (#2145)

* fix axis label size bug and accommodate dual axis chart

* don't adjust margins for bar time series

* handling this below now

* apply different margin padding if explore or dashboard

* fix linting

nekia/incubator-superset-dev,robert-digit/superset,apache/incubator-superset,robert-digit/superset,alanmcruickshank/superset-dev,airbnb/caravel,ArijanaBrlek/superset,mistercrunch/panoramix,dmigo/incubator-superset,airbnb/superset,ArijanaBrlek/superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,airbnb/superset,airbnb/superset,BRD-CD/superset,nekia/incubator-superset-dev,massgov/incubator-superset,nekia/incubator-superset-dev,SingTel-DataCo/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,robert-digit/superset,timifasubaa/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,asdf2014/superset,airbnb/caravel,airbnb/superset,massgov/incubator-superset,FrederichCheng/incubator-superset,dmigo/incubator-superset,airbnb/caravel,massgov/incubator-superset,nekia/incubator-superset-dev,timifasubaa/incubator-superset,timifasubaa/incubator-superset,asdf2014/superset,SingTel-DataCo/incubator-superset,FrederichCheng/incubator-superset,apache/incubator-superset,apache/incubator-superset,airbnb/caravel,massgov/incubator-superset,alanmcruickshank/superset-dev,alanmcruickshank/superset-dev,FrederichCheng/incubator-superset,BRD-CD/superset,apache/incubator-superset,mistercrunch/panoramix,BRD-CD/superset,asdf2014/superset,SingTel-DataCo/incubator-superset,dmigo/incubator-superset,timifasubaa/incubator-superset,SingTel-DataCo/incubator-superset,asdf2014/superset,ArijanaBrlek/superset,FrederichCheng/incubator-superset,BRD-CD/superset,robert-digit/superset,dmigo/incubator-superset,alanmcruickshank/superset-dev,mistercrunch/panoramix,ArijanaBrlek/superset