Fix compiler warning during strncpy

The size of 32 correspond to previously allocated block of memory and SHOULD be adapted accordingly

src/templates_text/templator_text.org

@@ -435,7 +435,7 @@ trexio_text_read_$group$ (trexio_text_t* const file)
             }
 
             size_t tmp_$group_dset$_len = strlen(buffer);
-            strncpy(tmp_$group_dset$, buffer, tmp_$group_dset$_len + 1);
+            strncpy(tmp_$group_dset$, buffer, 32);
             tmp_$group_dset$ += tmp_$group_dset$_len + 1;
           }
         }