Consistency in StatusBar UI

Suggestions by @redmunds on https://github.com/adobe/brackets/issues/8150

Add tooltip and underline text when hovering over the OVR/INS element. Change cursor to hand when hovering over the Lint icon.
This line of code should not be necessary if [previous comment](https://github.com/adobe/brackets/pull/8297/files#discussion_r14885167) is implemented, but otherwise the logic condition is incorrect.