patch 8.2.1927: Vim9: get unknown error with an error in a timer function

Problem:    Vim9: get unknown error with an error in a timer function.
Solution:   Use did_emsg instead of called_emsg. (closes #7231)
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 9c46651..abf88b1 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -828,7 +828,7 @@
     int		defcount = ufunc->uf_args.ga_len - argc;
     sctx_T	save_current_sctx = current_sctx;
     int		breakcheck_count = 0;
-    int		called_emsg_before = called_emsg;
+    int		did_emsg_before = did_emsg;
     int		save_suppress_errthrow = suppress_errthrow;
     msglist_T	**saved_msg_list = NULL;
     msglist_T	*private_msg_list = NULL;
@@ -853,7 +853,7 @@
 	    || (ufunc->uf_def_status == UF_TO_BE_COMPILED
 			  && compile_def_function(ufunc, FALSE, NULL) == FAIL))
     {
-	if (called_emsg == called_emsg_before)
+	if (did_emsg == did_emsg_before)
 	    semsg(_(e_function_is_not_compiled_str),
 						   printable_func_name(ufunc));
 	return FAIL;
@@ -2924,7 +2924,7 @@
     // Not sure if this is necessary.
     suppress_errthrow = save_suppress_errthrow;
 
-    if (ret != OK && called_emsg == called_emsg_before)
+    if (ret != OK && did_emsg == did_emsg_before)
 	semsg(_(e_unknown_error_while_executing_str),
 						   printable_func_name(ufunc));
     return ret;