Revert "Fusion: reduce dependency countdown branches"

This reverts commit 2762d00.

Author: michaelstaib

src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Execution/ExecutionState.cs

@@ -175,27 +175,27 @@ public void CompleteNode(
 
             foreach (var dependent in node.Dependents)
             {
-                var dependentId = dependent.Id;
-
-                if ((uint)dependentId >= (uint)_remainingDependencies.Length)
+                if ((uint)dependent.Id >= (uint)_remainingDependencies.Length)
                 {
                     continue;
                 }
 
-                var remainingDependencies = _remainingDependencies[dependentId];
+                var remainingDependencies = _remainingDependencies[dependent.Id];
 
                 if (remainingDependencies <= 0)
                 {
                     continue;
                 }
 
-                remainingDependencies--;
-                _remainingDependencies[dependentId] = remainingDependencies;
-
-                if (remainingDependencies == 0)
+                if (remainingDependencies == 1)
                 {
+                    _remainingDependencies[dependent.Id] = 0;
                     _ready.Add(dependent);
                 }
+                else if (remainingDependencies > 1)
+                {
+                    _remainingDependencies[dependent.Id] = remainingDependencies - 1;
+                }
             }
         }