fix(progress-indicator): correct prefix value from context

[tay1orjones]

The wrapper ul in progress indicator wasn't getting the prefix, so styles were broken. Just a minor correction to this.context from this.prefix

Changelog

Changed

• progress-indicator: fix prefix

Testing / Reviewing

Storybook should show that the wrapper ul in progress indicator gets the prefix in it's class:

- <ul class="undefined--progress">
+ <ul class="bx--progress">

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