Fix #11513: Don't always float navbar-text

`navbar-text` should only float when the navbar is expanded on larger
screens, otherwise the element might be (hidden) behind `navbar-nav`.
Fixes #11513.
X-Ref: #8820 #8815
Run grunt dist
Merge pull request #11514 from twbs/navbar-text-float-breakpoint

Fix #11513: Don't always float navbar-text