Revert "Make editor compatible with Windows high contrast themes"

This reverts commit 85a5290ee8a4c95be19f086181379330baf0deed.

The patch itself is good and it could maybe be readded in the future,
but right now Microsoft forced its Windows 10 "update" on people with older
Intel HD Graphics 3000 IGP without ensuring that they can ship proper drivers,
and such users seem to get Godot crashing due to this patch. Sorry :(
Closes #5452.

platform/windows/godot.manifest

@@ -1,24 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
-    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
-        <security>
-            <requestedPrivileges>
-                <requestedExecutionLevel level="asInvoker" uiAccess="false"/>
-            </requestedPrivileges>
-        </security>
-    </trustInfo>
-    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
-        <application>
-            <!-- Windows 10 -->
-            <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
-            <!-- Windows 8.1 -->
-            <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
-            <!-- Windows 8 -->
-            <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
-            <!-- Windows 7 -->
-            <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
-            <!-- Windows Vista -->
-            <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
-        </application>
-    </compatibility>
-</assembly>

platform/windows/godot_res.rc

@@ -1,4 +1,3 @@
-#include <winuser.h>
 #include "core/version.h"
 #ifndef _STR
 #define _STR(m_x) #m_x
@@ -7,8 +6,6 @@
 
 GODOT_ICON ICON platform/windows/godot.ico
 
-CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST platform/windows/godot.manifest
-
 1 VERSIONINFO
 FILEVERSION    	VERSION_MAJOR,VERSION_MINOR,0,0
 PRODUCTVERSION 	VERSION_MAJOR,VERSION_MINOR,0,0