Fix bins command (#1313)

pwndbg/commands/heap.py

@@ -40,7 +40,7 @@ def format_bin(bins: Bins, verbose=False, offset=None):
         offset = allocator.chunk_key_offset("fd")
 
     result = []
-    bins_type = bins.BinType
+    bins_type = bins.bin_type
 
     for size in bins.bins:
         b = bins.bins[size]

tests/gdb-tests/tests/heap/test_heap_bins.py

@@ -151,3 +151,5 @@ def test_heap_bins(start_binary):
     result = allocator.largebins()
     assert result.bin_type == BinType.LARGE
     assert result.bins[largebin_size].is_corrupted
+
+    gdb.execute("bins")