3203: Fix style in render.cpp r=Jupeyy a=def-

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## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Dennis Felsing <dennis@felsin9.de>
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bors[bot] 2020-10-27 12:20:18 +00:00 committed by GitHub
commit dd7da191f6
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@ -178,7 +178,7 @@ void CRenderTools::DrawRoundRectExt(float x, float y, float w, float h, float r,
const int Num = 8;
IGraphics::CFreeformItem ArrayF[Num * 4];
for(int i = 0; i < Num; i += 2)
{
float a1 = i / (float)Num * pi / 2;