Quick Reblog: Add keyboard navigation

[alleycatboy]

Description

Addresses #899.

While the popup's comment input or tag input are focused, this adds Ctrl + Enter to reblog and Escape to close the popup.

Demonstration

Ctrl + Enter to reblog in comment input field:

Ctrl + Enter to reblog in tag input field:

Escape to close the popup while either comment or tag field are focused:

Testing steps

Check the option in Quick Reblog's preferences and use Ctrl + Enter while either tag or input field are focused.