qt: Improve svg

- remove double point
- remove fill color
- limit coords to 4 digit numbers

Did the conversion from scratch for their AI file:

https://qtcompany.sharepoint.com/sites/Marketing-Public-Access/Shared%20Documents/Forms/AllItems.aspx?ga=1&id=%2Fsites%2FMarketing%2DPublic%2DAccess%2FShared%20Documents%2FQt%20Development%20Brand%20assets%20%2D%20Public%2FQt%20Logos%2FQt%20%2D%20Primary%20Logo%2FFor%20Designers%20and%20CMYK%20Printing%2FFor%20Print%20%2D%20CMYK%2FBlack

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>