Apply inherited background color to expansion panel headers

[yaffol]

The v-expansion-panel that is rendered for the ArrayLayoutRenderer is colored grey. The headers in the Vuetify docs are all white (or the parent background color).

I tracked this down to background-color: currentColor being applied in in VExpansionPanel.sass:153

I'm not sure why this is causing the grey colour (from the user agent's default button style) to be applied in the ArrayLayoutRenderer, whereas in the Vuetify docs, the parent's background shows through.

This applies background-color: inherit' on top ofbackground-color: currentColor`.

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