[cuebot] Fix bug preventing dispatching with a single active show (AcademySoftwareFoundation#2327)

When there's only one active show, the logic to randomize show order
inadvertently removes it from the list, leading to a frozen queue.


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## Summary by CodeRabbit

* **Bug Fixes**
* Improved shuffle behavior so host dispatching now randomizes show
order correctly when shuffle is enabled.

* **Tests**
* Updated unit test expectations to reflect the corrected dispatch
behavior.

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Author: DiegoTavares

cuebot/src/main/java/com/imageworks/spcue/dao/postgres/DispatcherDaoJdbc.java

@@ -191,10 +191,8 @@ private String handleInClause(String key, String query, int inValueLength) {
     private Set<String> findDispatchJobs(DispatchHost host, int numJobs, boolean shuffleShows) {
         LinkedHashSet<String> result = new LinkedHashSet<String>();
         List<SortableShow> shows = new LinkedList<SortableShow>(getBookableShows(host));
-        // shows were sorted. If we want it in random sequence, we need to shuffle it.
+        // Shuffle shows to get them processed randomly
         if (shuffleShows) {
-            if (!shows.isEmpty())
-                shows.remove(0);
             Collections.shuffle(shows);
         }
 

cuebot/src/test/java/com/imageworks/spcue/test/dispatcher/CoreUnitDispatcherTests.java

@@ -131,8 +131,7 @@ public void testdispatchHostToAllShows() {
         DispatchHost host = getHost();
 
         List<VirtualProc> procs = dispatcher.dispatchHostToAllShows(host);
-        // The first show is removed. findDispatchJobs: shows.remove(0).
-        assertEquals(0, procs.size());
+        assertEquals(1, procs.size());
     }
 
     @Test