patch 8.2.1504: Vim9: white space checks are only done for a :def function

Problem:    Vim9: white space checks are only done for a :def function.
Solution:   Also do checks at the script level.  Adjust the name of a few
            error messages.
diff --git a/src/dict.c b/src/dict.c
index 01a2eda..73190c4 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -862,7 +862,7 @@
 	    if (evaluate)
 	    {
 		if (*skipwhite(*arg) == ':')
-		    semsg(_(e_no_white_space_allowed_before), ":");
+		    semsg(_(e_no_white_space_allowed_before_str), ":");
 		else
 		    semsg(_(e_missing_dict_colon), *arg);
 	    }
@@ -881,7 +881,7 @@
 	}
 	if (vim9script && (*arg)[1] != NUL && !VIM_ISWHITE((*arg)[1]))
 	{
-	    semsg(_(e_white_space_required_after), ":");
+	    semsg(_(e_white_space_required_after_str), ":");
 	    clear_tv(&tvkey);
 	    goto failret;
 	}
@@ -924,7 +924,7 @@
 	{
 	    if (vim9script && (*arg)[1] != NUL && !VIM_ISWHITE((*arg)[1]))
 	    {
-		semsg(_(e_white_space_required_after), ",");
+		semsg(_(e_white_space_required_after_str), ",");
 		goto failret;
 	    }
 	    *arg = skipwhite(*arg + 1);
@@ -939,7 +939,7 @@
 	    if (evaluate)
 	    {
 		if (**arg == ',')
-		    semsg(_(e_no_white_space_allowed_before), ",");
+		    semsg(_(e_no_white_space_allowed_before_str), ",");
 		else
 		    semsg(_(e_missing_dict_comma), *arg);
 	    }