GS/TC: Unset m_from_target if it's also a source in CombineAlignedInsideTargets.

Issue is it was erasing the source which doesn't get passed back to the main draw function, so we should be setting m_from_target to null because it is linked.

Author: lightningterror

pcsx2/GS/Renderers/HW/GSTextureCache.cpp

@@ -2310,6 +2310,7 @@ void GSTextureCache::CombineAlignedInsideTargets(Target* target, GSTextureCache:
 					if (src && src->m_from_target == t)
 					{
 						src->m_texture = t->m_texture;
+						src->m_from_target = nullptr;
 						src->m_shared_texture = false;
 						src->m_target_direct = false;
 						t->m_texture = nullptr;