STYLE: avoid flush when dictionary {} closing (issue #1145)

- a holdover from introducing the endBlock() method

src/functionObjects/field/fieldAverage/fieldAverageItem/fieldAverageItemIO.C

@@ -169,7 +169,7 @@ Foam::Ostream& Foam::functionObjects::operator<<
         os.writeEntry("allowRestart", faItem.allowRestart_);
     }
 
-    os.endBlock() << flush;
+    os.endBlock();
 
     os.check(FUNCTION_NAME);