fix: correctly set the disk space flag

Boolean flag was set wrongly to false when disk space was actually available.

(cherry picked from commit bf58abc)

broker/src/main/java/io/camunda/zeebe/broker/system/partitions/ZeebePartition.java

@@ -440,7 +440,7 @@ public void onDiskSpaceAvailable() {
     actor.call(
         () -> {
           context.setDiskSpaceAvailable(true);
-          zeebePartitionHealth.setDiskSpaceAvailable(false);
+          zeebePartitionHealth.setDiskSpaceAvailable(true);
           if (context.getStreamProcessor() != null && context.shouldProcess()) {
             LOG.info("Disk space usage is below threshold. Resuming stream processor.");
             context.getStreamProcessor().resumeProcessing();