Remove duplicate dedup_legacy_create in common.run

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Robert Evans <[email protected]>
Closes #16926

Author: rrevans

tests/runfiles/common.run

@@ -677,8 +677,8 @@ post =
 tags = ['functional', 'deadman']
 
 [tests/functional/dedup]
-tests = ['dedup_legacy_create', 'dedup_fdt_create', 'dedup_fdt_import',
-    'dedup_legacy_create', 'dedup_legacy_import', 'dedup_legacy_fdt_upgrade',
+tests = ['dedup_fdt_create', 'dedup_fdt_import', 'dedup_legacy_create',
+    'dedup_legacy_import', 'dedup_legacy_fdt_upgrade',
     'dedup_legacy_fdt_mixed', 'dedup_quota']
 pre =
 post =