fix erroneous check for LOGICAL type VARCHAR, causing this to panic w…

…hen a BLOB (or BITSTRING) is scanned after being successfully compressed

src/storage/compression/zstd.cpp

@@ -889,7 +889,7 @@ struct ZSTDScanState : public SegmentScanState {
 
 	void ScanInternal(ZSTDVectorScanState &scan_state, idx_t count, Vector &result, idx_t result_offset) {
 		D_ASSERT(scan_state.scanned_count + count <= scan_state.metadata.count);
-		D_ASSERT(result.GetType().id() == LogicalTypeId::VARCHAR);
+		D_ASSERT(result.GetType().InternalType() == PhysicalType::VARCHAR);
 
 		string_length_t *string_lengths = &scan_state.string_lengths[scan_state.scanned_count];
 		idx_t uncompressed_length = 0;