patch 8.2.2225: Vim9: error when using :import in legacy script twice

Problem:    Vim9: error when using :import in legacy script twice.
Solution:   Make it possible to redefine an import when reloading.
diff --git a/src/evalvars.c b/src/evalvars.c
index 2de8b8d..f7982f7 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -2531,7 +2531,7 @@
 		    rettv->vval.v_string = vim_strsave(import->imp_funcname);
 		}
 	    }
-	    else if (import->imp_all)
+	    else if (import->imp_flags & IMP_FLAGS_STAR)
 	    {
 		emsg("Sorry, 'import * as X' not implemented yet");
 		ret = FAIL;