patch 8.2.1889: Vim9: errornous error for missing white space after {}

Problem:    Vim9: errornous error for missing white space after {}.
Solution:   Don't skip over white space after {}. (issue #7167)

src/dict.c

@@ -950,7 +950,7 @@ failret:
 	return FAIL;
     }
 
-    *arg = skipwhite(*arg + 1);
+    *arg = *arg + 1;
     if (evaluate)
 	rettv_dict_set(rettv, d);
 

src/testdir/test_vim9_expr.vim

@@ -1124,6 +1124,12 @@ def Test_expr5_vim9script()
   END
   CheckScriptFailure(lines, 'E15:', 2)
 
+  lines =<< trim END
+      vim9script
+      echo {} - 22
+  END
+  CheckScriptFailure(lines, 'E731:', 2)
+
   lines =<< trim END
       vim9script
       echo 'abc' is? 'abc'

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1889,
 /**/
     1888,
 /**/