Utils: Adjust name fillWithZero()

The name was quite missleading.

Change-Id: I538eca2a59e8a861e707fecd8331488e1919408a
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/utils/sizedarray.h

@@ -108,7 +108,7 @@ public:
         return m_size == 0;
     }
 
-    void fillWithZero()
+    void initializeElements()
     {
         std::array<T, MaxSize>::fill(T{});
     }