Fix injection.

channelwho/src/com/dmdirc/addons/channelwho/ChannelWhoModule.java

 /**
  * Dagger injection module for the Channel Who plugin.
  */
-@Module(injects = ChannelWhoPlugin.class, addsTo = ClientModule.class)
+@Module(injects = ChannelWhoManager.class, addsTo = ClientModule.class)
 public class ChannelWhoModule {
     private final String domain;