DolphinWX: Fix window growing on every relaunch

Fixes part of #8993 -- the window would grow slightly on every re-launch
because the size was set before the UI was fully initialized.

Source/Core/DolphinWX/Frame.cpp

@@ -469,6 +469,9 @@ CFrame::CFrame(wxFrame* parent,
 			ToggleLogConfigWindow(true);
 	}
 
+	// Set the size of the window after the UI has been built, but before we show it
+	SetSize(size);
+
 	// Show window
 	Show();