Fix alignment of onboarding area command labels

The command labels in a perspective's onboarding area are placed in a
right-aligned layout but the labels themselves are not right-aligned,
such that they are not perfectly right aligned as they can be up to 1
point off (which can sum up to multiple pixels with monitor zoom
values).

This change adapts the labels to be right aligned such that they
properly fit.

Author: HeikoKlare

bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/StackRenderer.java

@@ -313,7 +313,7 @@ private void initializeOnboardingInformationInEditorStack(CTabFolder editorStack
 
 			String[] commandAndText = commands[i].split("\\$\\$\\$"); //$NON-NLS-1$
 
-			WidgetFactory.label(SWT.NONE).text(commandAndText[0]).foreground(color)
+			WidgetFactory.label(SWT.NONE).text(commandAndText[0]).foreground(color).align(SWT.RIGHT)
 					.supplyLayoutData(labelGridDataFactory::create).create(onboardingComposite);
 			WidgetFactory.label(SWT.NONE).text(commandAndText[1]).foreground(color)
 					.supplyLayoutData(commandGridDataFactory::create).create(onboardingComposite);