core: JumpToApplicationThreadServerStreamListener should not close context (#3055)
core: JumpToApplicationThreadServerStreamListener should not close context (#3055)

Calling CancellableContext#close() multiple times does not cause problems, but is unnecessary here. The return value of getListener() is a ServerStreamListenerImpl, which already calls CancellableContext#cancel() inside of the finally block of ServerStreamListener#closed().
carl-mastrangelo/grpc-java,grpc/grpc-java,zpencer/grpc-java,grpc/grpc-java,pieterjanpintens/grpc-java,stanley-cheung/grpc-java,pieterjanpintens/grpc-java,zhangkun83/grpc-java,zpencer/grpc-java,rmichela/grpc-java,pieterjanpintens/grpc-java,ejona86/grpc-java,stanley-cheung/grpc-java,elandau/grpc-java,rmichela/grpc-java,simonhorlick/grpc-java,elandau/grpc-java,rmichela/grpc-java,elandau/grpc-java,carl-mastrangelo/grpc-java,stanley-cheung/grpc-java,dapengzhang0/grpc-java,zhangkun83/grpc-java,zhangkun83/grpc-java,grpc/grpc-java,simonhorlick/grpc-java,elandau/grpc-java,pieterjanpintens/grpc-java,stanley-cheung/grpc-java,grpc/grpc-java,dapengzhang0/grpc-java,zpencer/grpc-java,ejona86/grpc-java,zhangkun83/grpc-java,zpencer/grpc-java,rmichela/grpc-java,simonhorlick/grpc-java,simonhorlick/grpc-java,dapengzhang0/grpc-java,carl-mastrangelo/grpc-java,ejona86/grpc-java,dapengzhang0/grpc-java,ejona86/grpc-java,carl-mastrangelo/grpc-java