Adjust windows size on adding of bookmarks toolbar
Window adjusting is a bit delayed that can aid in session fingerprinting. Reproducable that way:
- 1000x700x24 - vanilla TB window
- 1000x668x24 - w/ bookmarks bar, right after adding
- 1000x700x24 - w/ bookmarks bar, after restart/new identity
I propose to adjust window size at (2) to be in the same state as at (3). It's better than dropping a warning but a warning can be a solution for the first time.