Ruler does not realign itself when toggling line numbers

[lkcampbell]

Repro Steps:

1. Launch Brackets and Toggle Ruler on.
2. Toggle the Line Numbers in the View Menu
3. Observe ruler behavior

Observed Result:
The ruler does not realign itself properly to the left when the number gutter appears or disappears.

Expected Result:
The ruler realigns itself properly to the left each time the line numbers are toggled.

Other Notes:
The fix for this issue depends upon the merging of pull request #4152.