my: Fixup tests after relicensing

4d9a613c (Relicense to GPLv3+ with wide exception for all Free Software
/ Open Source projects + Business options.) added more lines to
my/my_test.go than removed (@@ -5,16 +5,18 @@) so the line number of

        myline := Line()

changed by 2 (= 18 - 16).

Fix the test accordingly.

my/my_test.go

@@ -27,7 +27,7 @@ import (
 // goes first not to be broken by other edits
 func TestMyLine(t *testing.T) {
 	myline := Line()
-	want := 27
+	want := 29
 	if myline != want {
 		t.Errorf("my.Line() -> %v  ; want %v", myline, want)
 	}