System: Fix match window aspect ratio not working on startup

src/core/gte.cpp

@@ -157,7 +157,7 @@ ALWAYS_INLINE static u32 TruncateRGB(s32 value)
 
 void Initialize()
 {
-  UpdateAspectRatio();
+  s_aspect_ratio = DisplayAspectRatio::R4_3;
   Reset();
 }
 

src/core/system.cpp

@@ -1267,6 +1267,8 @@ bool System::Initialize(bool force_software_renderer)
     return false;
   }
 
+  GTE::UpdateAspectRatio();
+
   if (g_settings.gpu_pgxp_enable)
     PGXP::Initialize();