Fix Indeterminate Progress Bar animation in Firefox. Fixes #2258 #2273
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This is a bugfix | documentation fix.
Issue #2258
Proposed solution
Change CSS precedence of .progress:indeterminate::-moz-progress-bar and .progress.is-#{$name}::-moz-progress-bar.
This allow indeterminate bars to be transparent on Firefox, and allow background-image fill to be visible, which will restore the bar animation.
Tradeoffs
I didn't detect any issues.
Testing Done
Page https://bulma.io/documentation/elements/progress/#indeterminate tested locally on Firefox 63.0.3 and Chrome 71.0.3578.80