cairo: Fix yet another new clippy warning

error: the borrowed expression implements the required traits
   --> cairo/src/surface.rs:424:54
    |
424 |         assert!(surface.set_mime_data(MIME_TYPE_PNG, &[1u8, 10u8]).is_ok());
    |                                                      ^^^^^^^^^^^^ help: change this to: `[1u8, 10u8]`
    |
    = note: `-D clippy::needless-borrow` implied by `-D warnings`
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

Author: sdroege

cairo/src/surface.rs

@@ -421,7 +421,7 @@ mod tests {
         /* Initially the data for any mime type has to be none */
         assert!(data.is_none());
 
-        assert!(surface.set_mime_data(MIME_TYPE_PNG, &[1u8, 10u8]).is_ok());
+        assert!(surface.set_mime_data(MIME_TYPE_PNG, [1u8, 10u8]).is_ok());
         let data = surface.mime_data(MIME_TYPE_PNG).unwrap();
         assert_eq!(data, &[1u8, 10u8]);
     }