Make search box toggle key configurable (#3650)

Fixes #3641

src/main/java/appeng/client/gui/implementations/GuiMEMonitorable.java

@@ -40,6 +40,7 @@ import appeng.api.storage.ITerminalHost;
 import appeng.api.storage.data.IAEItemStack;
 import appeng.api.util.IConfigManager;
 import appeng.api.util.IConfigurableObject;
+import appeng.client.ActionKey;
 import appeng.client.gui.AEBaseMEGui;
 import appeng.client.gui.widgets.GuiImgButton;
 import appeng.client.gui.widgets.GuiScrollbar;
@@ -54,6 +55,7 @@ import appeng.container.slot.SlotCraftingMatrix;
 import appeng.container.slot.SlotFakeCraftingMatrix;
 import appeng.core.AEConfig;
 import appeng.core.AELog;
+import appeng.core.AppEng;
 import appeng.core.localization.GuiText;
 import appeng.core.sync.GuiBridge;
 import appeng.core.sync.network.NetworkHandler;
@@ -481,7 +483,7 @@ public class GuiMEMonitorable extends AEBaseMEGui implements ISortSource, IConfi
 
 		if( !this.checkHotbarKeys( key ) )
 		{
-			if( key == Keyboard.KEY_TAB )
+			if( AppEng.proxy.isActionKey( ActionKey.TOGGLE_FOCUS, key ) )
 			{
 				this.searchField.setFocused( !this.searchField.isFocused() );
 				return;