[AndyB] Removes quick thread form 1.3

Removes quick thread function.

Problems with the quick thread function:

• There's already a Post thread button, it's confusing to have redundant functions.
• Adds clutter to the forum view.
• Takes focus away from thread titles.

(Before add-on is installed)
View attachment 36968

(After add-on is installed)
View attachment 36969

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