patch 8.2.3392: augroup completion escapes regexp pattern characters

Problem:    augroup completion escapes regexp pattern characters.
Solution:   Do not escape the augroup name. (closes #8826)
diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 58ba759..6c92957 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -2134,8 +2134,8 @@
 	    {EXPAND_SYNTIME, get_syntime_arg, TRUE, TRUE},
 # endif
 	    {EXPAND_HIGHLIGHT, get_highlight_name, TRUE, TRUE},
-	    {EXPAND_EVENTS, get_event_name, TRUE, TRUE},
-	    {EXPAND_AUGROUP, get_augroup_name, TRUE, TRUE},
+	    {EXPAND_EVENTS, get_event_name, TRUE, FALSE},
+	    {EXPAND_AUGROUP, get_augroup_name, TRUE, FALSE},
 # ifdef FEAT_CSCOPE
 	    {EXPAND_CSCOPE, get_cscope_name, TRUE, TRUE},
 # endif