patch 9.0.0713: <amatch> of MenuPopup event is expanded like a file name

Problem:    <amatch> of MenuPopup event is expanded like a file name.
Solution:   Do not expand <amatch> for MenuPopup. (closes #11328)
diff --git a/src/autocmd.c b/src/autocmd.c
index 599db46..93da0bb 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -2095,6 +2095,7 @@
 		|| event == EVENT_DIRCHANGED
 		|| event == EVENT_DIRCHANGEDPRE
 		|| event == EVENT_MODECHANGED
+		|| event == EVENT_MENUPOPUP
 		|| event == EVENT_USER
 		|| event == EVENT_WINCLOSED
 		|| event == EVENT_WINSCROLLED)