When executing `kdialog --geticon`, some errors would shown:
```
$ kdialog --geticon
qt.svg: /usr/share/icons/breeze-dark/applets/128/user-ada-lovelace.svg:68: Could not resolve property: #linearGradient6624
qt.svg: /usr/share/icons/breeze-dark/applets/128/user-ada-lovelace.svg:68: Could not resolve property: #linearGradient6626
qt.svg: /usr/share/icons/breeze-dark/applets/128/user-leonardo-da-vinci.svg:79: Could not resolve property: #linearGradient6634
```
... And those 2 icons doesn't have correct shadow. This patch fixes it.