patch 8.2.2185: BufUnload is not triggered for the quickfix dummy buffer

Problem:    BufUnload is not triggered for the quickfix dummy buffer.
Solution:   Do trigger BufUnload. (Pontus Leitzler,closes #7518, closes #7517)
            Fix white space around "=".
diff --git a/src/quickfix.c b/src/quickfix.c
index 89ca2d3..697a3d4 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -6513,7 +6513,7 @@
 	enter_cleanup(&cs);
 #endif
 
-	wipe_buffer(buf, FALSE);
+	wipe_buffer(buf, TRUE);
 
 #if defined(FEAT_EVAL)
 	// Restore the error/interrupt/exception state if not discarded by a