E0102 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0102.rs

Error E0102 needs a span_label, updating it from:

error[E0102]: cannot determine a type for this local variable: unconstrained type
  --> src/test/compile-fail/E0102.rs:12:9
   |
12 |     let x = []; //~ ERROR E0102
   |         ^^^^^^

To:

error[E0102]: cannot determine a type for this local variable: unconstrained type
  --> src/test/compile-fail/E0102.rs:12:9
   |
12 |     let x = []; //~ ERROR E0102
   |         ^^^^^^ cannot resolve type of variable