BBox: Changed the rounding again, the old one fixed Paper Mario but had bugs in Mickey's Magical Mirror. This change fixes the glitches in both games.

Also fixed some compiler warnings.

Source/Core/VideoBackends/D3D/FramebufferManager.cpp

@@ -179,7 +179,7 @@ void FramebufferManager::GetTargetSize(unsigned int *width, unsigned int *height
 	*height = targetSource.bottom - targetSource.top;
 }
 
-void XFBSource::Draw(const MathUtil::Rectangle<float> &sourcerc,
+void XFBSource::Draw(const MathUtil::Rectangle<int> &sourcerc,
 	const MathUtil::Rectangle<float> &drawrc) const
 {
 	D3D::drawShadedTexSubQuad(tex->GetSRV(), &sourcerc,