Enable DPI aware setting in Lazarus demos for Windows

Cleanup some useless code in Lazarus demos for Windows

demos/Lazarus_Windows/SimpleBrowser2/SimpleBrowser2.lpi

@@ -11,6 +11,9 @@
       <Title Value="SimpleBrowser2"/>
       <ResourceType Value="res"/>
       <UseXPManifest Value="True"/>
+      <XPManifest>
+        <DpiAware Value="True/PM_V2"/>
+      </XPManifest>
       <Icon Value="0"/>
     </General>
     <BuildModes Count="1">

demos/Lazarus_Windows/SimpleBrowser2/SimpleBrowser2.lpr

@@ -11,10 +11,8 @@ uses
 
 {$R *.res}
 
-{$IFDEF MSWINDOWS}
-  // CEF3 needs to set the LARGEADDRESSAWARE flag which allows 32-bit processes to use up to 3GB of RAM.
-  {$SetPEFlags $20}
-{$ENDIF}
+// CEF needs to set the LARGEADDRESSAWARE ($20) flag which allows 32-bit processes to use up to 3GB of RAM.
+{$IFDEF WIN32}{$SetPEFlags $20}{$ENDIF}
 
 begin
   GlobalCEFApp := TCefApplication.Create;