Set compiler.problem.forbiddenReference to error for all projects

If it's not already an error.

Author: HannesWell

bundles/org.eclipse.swt.svg/.settings/org.eclipse.jdt.core.prefs

@@ -4,6 +4,7 @@ org.eclipse.jdt.core.compiler.compliance=21
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=error
 org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=enabled
 org.eclipse.jdt.core.compiler.source=21

bundles/org.eclipse.swt/.settings/org.eclipse.jdt.core.prefs

@@ -10,6 +10,7 @@ org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=error
 org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=enabled
 org.eclipse.jdt.core.compiler.source=21