patch 8.1.2051: double-click test is a bit flaky

Problem:    Double-click test is a bit flaky.
Solution:   Correct entry in list of flaky tests.
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
index 5623dc8..d9177e0 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -333,7 +333,7 @@
       \ 'Test_raw_one_time_callback()',
       \ 'Test_reltime()',
       \ 'Test_server_crash()',
-      \ 'Test_term_mouse_double_click_to_create_tab',
+      \ 'Test_term_mouse_double_click_to_create_tab()',
       \ 'Test_terminal_ansicolors_default()',
       \ 'Test_terminal_ansicolors_func()',
       \ 'Test_terminal_ansicolors_global()',
diff --git a/src/version.c b/src/version.c
index a2c5ddd..af656f2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2051,
+/**/
     2050,
 /**/
     2049,