Code cleanup.

Converted rest of .clone() s on ref pointer to use the macro instead.
Stopped ignoring clippy clone_on_ref_pointer warnings since there shouldn't
be any, anymore.

hammond-gtk/src/widgets/episode.rs

@@ -1,6 +1,4 @@
 
-#![cfg_attr(feature = "cargo-clippy", allow(clone_on_ref_ptr))]
-
 use open;
 use diesel::prelude::SqliteConnection;
 use hammond_data::dbqueries;