fix(ansi): truncate: add test case for width greater than input

ansi/truncate_test.go

@@ -16,6 +16,7 @@ var tcases = []struct {
 	{"equalascii", "one", ".", 3, "one"},
 	{"equalemoji", "on👋", ".", 3, "on."},
 	{"equalcontrolemoji", "one\x1b[0m", ".", 3, "one\x1b[0m"},
+	{"truncate_tail_greater", "foo", "...", 5, "foo"},
 	{"simple", "foobar", "", 3, "foo"},
 	{"passthrough", "foobar", "", 10, "foobar"},
 	{"ascii", "hello", "", 3, "hel"},