core: Resolve misc cases of variable shadowing

Resolves shadowing warnings that aren't in a particularly large
subsection of core. Brings us closer to turning -Wshadow into an error.

All that remains now is for cases in the kernel (left untouched for now
since a big change by bunnei is pending), and a few left over in the
service code (will be tackled next).

src/core/memory/cheat_engine.h

@@ -68,7 +68,7 @@ public:
     void Initialize();
     void SetMainMemoryParameters(VAddr main_region_begin, u64 main_region_size);
 
-    void Reload(std::vector<CheatEntry> cheats);
+    void Reload(std::vector<CheatEntry> reload_cheats);
 
 private:
     void FrameCallback(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);