E0206 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/coherence-impls-copy.rs

Error E0206 needs a span_label and a title update, updating it from:

error[E0206]: the trait `Copy` may not be implemented for this type; type is not a structure or enumeration
  --> src/test/compile-fail/coherence-impls-copy.rs:40:1
   |
40 | impl Copy for [MyType] {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^

To:

error[E0206]: the trait `Copy` may not be implemented for this type
  --> src/test/compile-fail/coherence-impls-copy.rs:40:1
   |
40 | impl Copy for [MyType] {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^ type is not a structure or enumeration

Bonus: fix the span so it's on the type rather than the whole impl:

error[E0206]: the trait `Copy` may not be implemented for this type
  --> src/test/compile-fail/coherence-impls-copy.rs:40:1
   |
40 | impl Copy for [MyType] {}
   |               ^^^^^^^^ type is not a structure or enumeration