interactive-dialog: Drop window shadow option

Alice Mikhaylenko requested to merge wip/exalm/shadow into master

The window shadow looks very dated, and doesn't match CSD window shadows. Moreover, screenshots of CSD windows now include their actual shadow, so this shadow stacks with it. While legacy windows still don't have shadow on screenshots, it should be fixed in mutter rather than here, so just drop the option and assume it's off.

Fixes #79 (closed)

Edited by Alice Mikhaylenko

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