Enable DPI aware setting in Lazarus demos for Windows

Cleanup some useless code in Lazarus demos for Windows

demos/Lazarus_Windows/PopupBrowser/PopupBrowser.lpi

@@ -16,6 +16,9 @@
       <UseAppBundle Value="False"/>
       <ResourceType Value="res"/>
       <UseXPManifest Value="True"/>
+      <XPManifest>
+        <DpiAware Value="True/PM_V2"/>
+      </XPManifest>
     </General>
     <BuildModes Count="1">
       <Item1 Name="Default" Default="True"/>

demos/Lazarus_Windows/PopupBrowser/PopupBrowser.lpr

@@ -3,22 +3,15 @@ program PopupBrowser;
 {$I ..\..\..\source\cef.inc}
 
 uses
-  {$IFDEF DELPHI16_UP}
-  Vcl.Forms,
-  WinApi.Windows,
-  {$ELSE}
-  Forms, Interfaces,
+  Forms,
+  Interfaces,
   Windows,
-  {$ENDIF }
   uCEFApplication,
   uMainForm in 'uMainForm.pas' {MainForm},
   uChildForm in 'uChildForm.pas' {ChildForm};
 
-//{$R *.res}
-
-// CEF3 needs to set the LARGEADDRESSAWARE flag which allows 32-bit processes to use up to 3GB of RAM.
-// If you don't add this flag the rederer process will crash when you try to load large images.
-{$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}
+// CEF needs to set the LARGEADDRESSAWARE ($20) flag which allows 32-bit processes to use up to 3GB of RAM.
+{$IFDEF WIN32}{$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}{$ENDIF}
 
 {$R *.res}
 
@@ -28,9 +21,6 @@ begin
   if GlobalCEFApp.StartMainProcess then
     begin
       Application.Initialize;
-      {$IFDEF DELPHI11_UP}
-      Application.MainFormOnTaskbar := True;
-      {$ENDIF}
       Application.CreateForm(TMainForm, MainForm);
       Application.Run;
     end;