sp_IndexCleanup: fix heap table index detection (#727)

The partition stats row count filter used ps.index_id = 1 which only
matches clustered indexes. Heaps use index_id = 0, so heap tables
were excluded entirely from deduplication analysis.

Changed to ps.index_id IN (0, 1) to include both heaps and clustered.

Closes #727

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: erikdarlingdata

sp_IndexCleanup/sp_IndexCleanup.sql

@@ -2311,7 +2311,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
             nvarchar(MAX),
             N'.sys.dm_db_partition_stats ps
         WHERE ps.object_id = i.object_id
-        AND   ps.index_id = 1
+        AND   ps.index_id IN (0, 1)
         AND   ps.row_count >= @min_rows
     )'
         );