plugin manager: remove extra injectMembers() call

This has been here a long time, but as far as we can tell is no longer
necessary. It is causing double instantiation of classes which are only
injected a single place.

runelite-client/src/main/java/net/runelite/client/plugins/PluginManager.java

@@ -525,7 +525,6 @@ public class PluginManager
 				binder.install(plugin);
 			};
 			Injector pluginInjector = parent.createChildInjector(pluginModule);
-			pluginInjector.injectMembers(plugin);
 			plugin.injector = pluginInjector;
 		}
 		catch (CreationException ex)