estr: simplify EStr.lines a little.

* lib/zile/estr.lua (EStr.lines): Simplify slightly.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
maint: fix comment bitrot in lib/zile/lib.lua.

* lib/zile/lib.lua (iscallable): Correct bitrot in comment.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>