[code style] Fix clang-tidy hit after 3d68570 (#1183)

Author: mzhukova

sources/middle-layer/compression/deflate/compression_units/auxiliary_units.cpp

@@ -319,7 +319,7 @@ auto deflate_body_with_dictionary(deflate_state<execution_path_t::software>& str
     uint32_t       avail_in       = stream.isal_stream_ptr_->avail_in;
     int32_t        buf_hist_start = 0;
     uint32_t       size           = 0;
-    uint16_t       flush_start    = stream.isal_stream_ptr_->flush;
+    const uint16_t flush_start    = stream.isal_stream_ptr_->flush;
 
     update_hash(stream, isal_state->buffer, isal_state->b_bytes_processed);
     uint32_t history_size = get_history_size(stream, start_in, buf_hist_start);