Change default PluginPanel layout to DynamicGrid

This serves as better default for new plugin panels, as it is not
forcing same heihgt for all elements, what is undesired behaviour in
most of the cases. The current implementations of plugin panels remains
unchanged.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

runelite-client/src/main/java/net/runelite/client/ui/PluginPanel.java

@@ -26,7 +26,6 @@ package net.runelite.client.ui;
 
 import java.awt.BorderLayout;
 import java.awt.Dimension;
-import java.awt.GridLayout;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.ScrollPaneConstants;
@@ -59,7 +58,7 @@ public abstract class PluginPanel extends JPanel
 		if (wrap)
 		{
 			setBorder(BORDER_PADDING);
-			setLayout(new GridLayout(0, 1, 0, 3));
+			setLayout(new DynamicGridLayout(0, 1, 0, 3));
 			setBackground(ColorScheme.DARK_GRAY_COLOR);
 
 			final JPanel northPanel = new JPanel();