patch 8.2.2383: focus escape sequences are not named

Problem:    Focus escape sequences are not named in ":set termcap" output.
Solution:   Add the names to the list. (closes #7718)
diff --git a/src/misc2.c b/src/misc2.c
index 52e0499..5a6d863 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2531,6 +2531,8 @@
     {K_CURSORHOLD,	(char_u *)"CursorHold"},
     {K_IGNORE,		(char_u *)"Ignore"},
     {K_COMMAND,		(char_u *)"Cmd"},
+    {K_FOCUSGAINED,	(char_u *)"FocusGained"},
+    {K_FOCUSLOST,	(char_u *)"FocusLost"},
     {0,			NULL}
     // NOTE: When adding a long name update MAX_KEY_NAME_LEN.
 };