Anim: fix unsafe use of BLI_snprintf_rlen() in the NLA drawing code

Replace `BLI_snprintf_rlen()` with `STRNCPY_RLEN()`, as the string to
copy is not actually a printf-style format string, but just a plain string.

Pull Request: https://projects.blender.org/blender/blender/pulls/124228

source/blender/editors/space_nla/nla_draw.cc

@@ -631,7 +631,7 @@ static void nla_draw_strip_text(AnimData *adt,
 
   /* just print the name and the range */
   if (strip->flag & NLASTRIP_FLAG_TEMP_META) {
-    str_len = BLI_snprintf_rlen(str, sizeof(str), DATA_("Temp-Meta"));
+    str_len = STRNCPY_RLEN(str, DATA_("Temp-Meta"));
   }
   else {
     str_len = STRNCPY_RLEN(str, strip->name);