check table size greater than (#77)

Check if table size is greater than buffer length, instead of the other
way around.

I run into an exception because i am flushing my compressor, and then
write a chunk that is bigger, than what the buffer is can contain.

Co-authored-by: Brant Burnett <bburnett@centeredgesoftware.com>

Author: ak88

Snappier/Internal/HashTable.cs

@@ -25,7 +25,7 @@ public void EnsureCapacity(int inputSize)
             var maxFragmentSize = Math.Min(inputSize, (int) Constants.BlockSize);
             var tableSize = CalculateTableSize(maxFragmentSize);
 
-            if (_buffer is null || tableSize < _buffer.Length)
+            if (_buffer is null || tableSize > _buffer.Length)
             {
                 if (_buffer is not null)
                 {