Bug 1037146 - The "remember password" check box in the wifi connection d...

...etails page in the FTU app is cut off on the right edge in RTL mode
I think it's be better if we just touch `padding-left` and `padding-right` values instead of declaring also top and bottom.
This way if one day the top and bottom values change, we don't have to re-change them again here. :)