fix for the issue #6238

This PR addresses issue #6238.
All the elements of "Find in Files" ( Ctrl-Shift-F ) (i.e. label text input and buttons), are in one line.
![find-in-files fixed](https://f.cloud.github.com/assets/2771653/1839057/aba3bf5a-746f-11e3-8d80-9f8239eb60c0.png)

I left the "Find and Replace" ( Ctrl-H ) as it was instead of forcing the "find-group" and "replace-group" into one line, as it seems more fit to me than forcing them in one line.
![find-replace untouched](https://f.cloud.github.com/assets/2771653/1839059/c5f55f1c-746f-11e3-9ae1-039472c8498e.png)

It seems more fit because the elements (i.e. label text input and buttons) of "find-group" and "replace-group" do not get broken down to many lines; they separately stay in one line only. Leaving the situation as it is will ease the "Replace" feature, when he/she is working in "Live Preview".