refactor(batch): remove redundant condition

By definition, send() will only send data if the batch is full.

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/batch/BatchContext.java

@@ -643,10 +643,7 @@ private void trySend() {
         awaitState(State::canPrepareNext, "can prepare next");
 
         while (!Thread.currentThread().isInterrupted()) {
-          // TODO(dyma): this check is redundant, send will only send while batch is full;
-          if (batch.isFull()) {
-            send();
-          }
+          send(); // Only sends if the batch is full.
 
           TaskHandle task = queue.take();