ImguiSystem: change default keys

The home key should be reserved for console input as this is useful when running script code through the console, and needing to switch cursor positions to fix a typo or copy something. Page Up and Page Down weren't used and are less likely to be used by something in the game, remapped the defaults' secondary to these keys.

src/thirdparty/imgui/misc/imgui_utility.h

@@ -9,13 +9,13 @@ public:
     struct
     {
         int m_nBind0 = VK_OEM_3;
-        int m_nBind1 = VK_INSERT;
+        int m_nBind1 = VK_PRIOR;
     } m_ConsoleConfig;
 
     struct
     {
         int m_nBind0 = VK_F10;
-        int m_nBind1 = VK_HOME;
+        int m_nBind1 = VK_NEXT;
     } m_BrowserConfig;
 
     void Load();