AK: Inline the bucket index calculation

The result of the modulo is only used in the array index, so why
make the code more complex by calculating it in two different places?

AK/HashTable.h

@@ -308,9 +308,9 @@ private:
     {
         if (is_empty())
             return nullptr;
-        size_t bucket_index = hash % m_capacity;
+
         for (;;) {
-            auto& bucket = m_buckets[bucket_index];
+            auto& bucket = m_buckets[hash % m_capacity];
 
             if (usable_bucket_for_writing && !*usable_bucket_for_writing && !bucket.used) {
                 *usable_bucket_for_writing = &bucket;
@@ -323,7 +323,6 @@ private:
                 return nullptr;
 
             hash = double_hash(hash);
-            bucket_index = hash % m_capacity;
         }
     }
 
@@ -348,14 +347,12 @@ private:
         else if (usable_bucket_for_writing)
             return *usable_bucket_for_writing;
 
-        size_t bucket_index = hash % m_capacity;
 
         for (;;) {
-            auto& bucket = m_buckets[bucket_index];
+            auto& bucket = m_buckets[hash % m_capacity];
             if (!bucket.used)
                 return bucket;
             hash = double_hash(hash);
-            bucket_index = hash % m_capacity;
         }
     }