console.c (FindCompletion): silence stupid -Wstringop-truncation from…

… gcc-14

console.c: In function 'FindCompletion':
console.c:859:33: warning: '__builtin_strncpy' output may be truncated copying 31 bytes from a string of length 31 [-Wstringop-truncation]
  859 |                                 strncpy (matched, file->name, sizeof(matched)-1);
      |                                 ^~~~~~~

Quake/console.c

@@ -840,7 +840,7 @@ FindCompletion -- stevenaaus
 */
 const char *FindCompletion (const char *partial, filelist_item_t *filelist, int *nummatches_out)
 {
-	static char matched[32];
+	static char matched[40];
 	char *i_matched, *i_name;
 	filelist_item_t	*file;
 	int   init, match, plen;