Fix ImageBrowserView combos popup transparency

On Fedora 43 system SWT.COLOR_LIST_BACKGROUND comes with transparency
set and this misrenders combos popup as the color is inherited by
children. Not setting any color at all is the simplest and most
naturally fitting choice to fix the problem.

Author: akurtakov

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/views/imagebrowser/ImageBrowserView.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2012, 2018 Christian Pontesegger and others.
+ *  Copyright (c) 2012, 2025 Christian Pontesegger and others.
  *
  *  This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License 2.0
@@ -167,7 +167,6 @@ public ImageBrowserView() {
 	public void createPartControl(final Composite parent) {
 		final Composite composite = SWTFactory.createComposite(parent, 1, 1, GridData.FILL_BOTH, 0, 0);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, IHelpContextIds.IMAGE_BROWSER_VIEW);
-		composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
 		Composite topComp = new Composite(composite, SWT.NONE);
 		RowLayout layout = new RowLayout();
 		// need to center vertically, otherwise its looks misaligned
@@ -231,12 +230,9 @@ public void createPartControl(final Composite parent) {
 		spinMaxImages.setSelection(250);
 		spinMaxImages.setLayoutData(GridDataFactory.fillDefaults().create());
 		spinMaxImages.addModifyListener(e -> {
-			Display.getCurrent().asyncExec(new Runnable() {
-				@Override
-				public void run() {
-					page = 0; // reset to 1st page
-					scanImages();
-				}
+			Display.getCurrent().asyncExec(() -> {
+				page = 0; // reset to 1st page
+				scanImages();
 			});
 		});