Format ui tests with rustfmt

`rustfmt tests/ui/*.rs`

tests/ui/from-backtrace-backtrace.rs

@@ -5,6 +5,11 @@ use thiserror::Error;
 
 #[derive(Error, Debug)]
 #[error("...")]
-pub struct Error(#[from] #[backtrace] std::io::Error, Backtrace);
+pub struct Error(
+    #[from]
+    #[backtrace]
+    std::io::Error,
+    Backtrace,
+);
 
 fn main() {}

tests/ui/from-backtrace-backtrace.stderr

@@ -1,5 +1,5 @@
 error: deriving From requires no fields other than source and backtrace
- --> tests/ui/from-backtrace-backtrace.rs:8:18
+ --> tests/ui/from-backtrace-backtrace.rs:9:5
   |
-8 | pub struct Error(#[from] #[backtrace] std::io::Error, Backtrace);
+9 |     #[from]
   |     ^^^^^^^

tests/ui/source-enum-not-error.rs

@@ -6,9 +6,7 @@ pub struct NotError;
 #[derive(Error, Debug)]
 #[error("...")]
 pub enum ErrorEnum {
-    Broken {
-        source: NotError,
-    },
+    Broken { source: NotError },
 }
 
 fn main() {}

tests/ui/source-enum-not-error.stderr

@@ -1,5 +1,5 @@
 error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but its trait bounds were not satisfied
-  --> tests/ui/source-enum-not-error.rs:10:9
+ --> tests/ui/source-enum-not-error.rs:9:14
   |
 4 | pub struct NotError;
   | -------------------
@@ -7,7 +7,7 @@ error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but it
   | doesn't satisfy `NotError: AsDynError<'_>`
   | doesn't satisfy `NotError: std::error::Error`
 ...
-10 |         source: NotError,
+9 |     Broken { source: NotError },
   |              ^^^^^^ method cannot be called on `&NotError` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:

tests/ui/transparent-enum-not-error.rs

@@ -3,9 +3,7 @@ use thiserror::Error;
 #[derive(Error, Debug)]
 pub enum Error {
     #[error(transparent)]
-    Other {
-        message: String,
-    }
+    Other { message: String },
 }
 
 fn main() {}