lineedit.svg: align heights of button and text field
The margins affect the height of a text field. To make sure the new radius doesn't cause discrepancy between the button and the text field, shrink the margin by 2 units.
Amends 69e1d4e7
BUG: 485688 FIXED-IN: 6.1
| Screenshot | |
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| Before (master branch) |  |
| After (Same as Plasma/6.0) |  |