client: correctly use Runnables::doNothing

passing it as a method reference complete defeats the point of the
method as it desugars to:
option("foo", () ->
{
  Runnable unused = Runnables.doNothing();
});

runelite-client/src/main/java/net/runelite/client/plugins/banktags/tabs/TabInterface.java

@@ -447,7 +447,7 @@ public class TabInterface
 						})
 					)
 					.option("2. Only tab", () -> clientThread.invoke(() -> deleteTab(target)))
-					.option("3. Cancel", Runnables::doNothing)
+					.option("3. Cancel", Runnables.doNothing())
 					.build();
 				break;
 			case Tab.EXPORT_TAB:

runelite-client/src/main/java/net/runelite/client/plugins/chatchannel/ChatChannelPlugin.java

@@ -809,7 +809,7 @@ public class ChatChannelPlugin extends Plugin
 					kickConfirmed = false;
 				})
 			)
-			.option("2. Cancel", Runnables::doNothing)
+			.option("2. Cancel", Runnables.doNothing())
 			.build();
 	}
 

runelite-client/src/main/java/net/runelite/client/plugins/groundmarkers/GroundMarkerSharingManager.java

@@ -202,7 +202,7 @@ class GroundMarkerSharingManager
 
 		chatboxPanelManager.openTextMenuInput("Are you sure you want to import " + importPoints.size() + " ground markers?")
 			.option("Yes", () -> importGroundMarkers(importPoints))
-			.option("No", Runnables::doNothing)
+			.option("No", Runnables.doNothing())
 			.build();
 	}
 
@@ -275,7 +275,7 @@ class GroundMarkerSharingManager
 					+ (numActivePoints == 1 ? " was cleared." : "s were cleared."));
 
 			})
-			.option("No", Runnables::doNothing)
+			.option("No", Runnables.doNothing())
 			.build();
 	}