Fix the initialization of Completable.complete() (#4146)

Author: akarnokd

src/main/java/rx/Completable.java

@@ -93,15 +93,15 @@ public void call(CompletableSubscriber s) {
             s.onSubscribe(Subscriptions.unsubscribed());
             s.onCompleted();
         }
-    }, true); // hook is handled in complete()
+    }, false); // hook is handled in complete()
 
     /** Single instance of a never Completable. */
     static final Completable NEVER = new Completable(new CompletableOnSubscribe() {
         @Override
         public void call(CompletableSubscriber s) {
             s.onSubscribe(Subscriptions.unsubscribed());
         }
-    }, true); // hook is handled in never()
+    }, false); // hook is handled in never()
 
     /**
      * Returns a Completable which terminates as soon as one of the source Completables
@@ -315,7 +315,7 @@ public static Completable complete() {
         if (cos == COMPLETE.onSubscribe) {
             return COMPLETE;
         }
-        return new Completable(cos, true);
+        return new Completable(cos, false);
     }
 
     /**
@@ -742,7 +742,7 @@ public static Completable never() {
         if (cos == NEVER.onSubscribe) {
             return NEVER;
         }
-        return new Completable(cos, true);
+        return new Completable(cos, false);
     }
 
     /**