E0005 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0005.rs

E0005 needs a span_label, taking it from:

error[E0005]: refutable pattern in local binding: `None` not covered
  --> src/test/compile-fail/E0005.rs:13:9
   |
13 |     let Some(y) = x; //~ ERROR E0005
   |         ^^^^^^^

to:

error[E0005]: refutable pattern in local binding: `None` not covered
  --> src/test/compile-fail/E0005.rs:13:9
   |
13 |     let Some(y) = x; //~ ERROR E0005
   |         ^^^^^^^ pattern `None` not covered