Give dialog text editors room to expand

[smashwilson]

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Description of the Change

Supply missing width: 100% styles to give TextEditors in dialog boxes room to fill.

Screenshot

Dialog	Before	After
Create
Publish

Applicable Issues

Fixes #2433.

Release Notes

• Corrected an issue where text boxes in the "create repository" and "publish repository" dialogs were too short to enter text.