Fix CID 1395114 ('Constant' variable guards dead code)

Signed-off-by: Stefan Weil <[email protected]>

Author: stweil

src/ccmain/fixspace.cpp

@@ -808,7 +808,7 @@ float Tesseract::blob_noise_score(TBLOB *blob) {
 
 void fixspace_dbg(WERD_RES *word) {
   TBOX box = word->word->bounding_box();
-  bool show_map_detail = false;
+  const bool show_map_detail = false;
   int16_t i;
 
   box.print();