patch 8.2.0250: test_clear_search_pat() is unused

Problem:    test_clear_search_pat() is unused.
Solution:   Remove the function. (Yegappan Lakshmanan, closes #5624)
diff --git a/src/version.c b/src/version.c
index 7c31c19..a28fc03 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    250,
+/**/
     249,
 /**/
     248,