Fix; correct placement of type inference error for method calls

[Jamesbarford]

Addresses a FIXME for displaying errors on method calls;

Before;

error[E0282]: type annotations needed
  --> /<location>/src/main.rs:48:15
   |
## |             e.is_conversion_error();
   |               ^^^^^^^^^^^^^^^^^^^ cannot infer type

After;

error[E0282]: type annotations needed
  --> /<location>/src/main.rs:48:15
   |
## |             e.is_conversion_error();
   |             ^ cannot infer type

[rustbot]

This PR modifies tests/ui/issues/. If this PR is adding new tests to tests/ui/issues/,
please refrain from doing so, and instead add it to more descriptive subdirectories.

[rustbot]

r? @davidtwco

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