fix(gui): use correct font and style for certificate panel

jadx-gui/src/main/java/jadx/gui/ui/CertificatePanel.java

@@ -3,21 +3,26 @@ package jadx.gui.ui;
 import javax.swing.*;
 import java.awt.*;
 
+import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
+
 import jadx.gui.treemodel.JNode;
 
-public class CertificatePanel extends ContentPanel {
+public final class CertificatePanel extends ContentPanel {
+	private static final long serialVersionUID = 8566591625905036877L;
+
+	private final RSyntaxTextArea textArea;
+
 	CertificatePanel(TabbedPane panel, JNode jnode) {
 		super(panel, jnode);
 		setLayout(new BorderLayout());
-        JTextArea textArea = new JTextArea(jnode.getContent());
-        textArea.setFont(textArea.getFont().deriveFont(12f)); // will only change size to 12pt
+		textArea = new RSyntaxTextArea(jnode.getContent());
+		loadSettings();
 		JScrollPane sp = new JScrollPane(textArea);
 		add(sp);
 	}
 
 	@Override
 	public void loadSettings() {
-
-
+		CodeArea.loadCommonSettings(getTabbedPane().getMainWindow(), textArea);
 	}
 }