[librsvg] Use unwrap_or_default(); RsvgRectangle implements Default.

[Federico Mena Quintero <federico src gnome org>]

commit d142d6a2007a42ff74d95960818f5a3b847a1888
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Dec 27 21:05:22 2018 -0600

    Use unwrap_or_default(); RsvgRectangle implements Default.
    
    Thanks to Sebastian Dröge for the suggestion.

 rsvg_internals/src/handle.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/rsvg_internals/src/handle.rs b/rsvg_internals/src/handle.rs
index ece4cb41..60a80898 100644
--- a/rsvg_internals/src/handle.rs
+++ b/rsvg_internals/src/handle.rs
@@ -270,11 +270,11 @@ impl Handle {
         let ink_rect = bbox
             .ink_rect
             .map(|r| RsvgRectangle::from(r))
-            .unwrap_or_else(|| RsvgRectangle::default());
+            .unwrap_or_default();
         let logical_rect = bbox
             .rect
             .map(|r| RsvgRectangle::from(r))
-            .unwrap_or_else(|| RsvgRectangle::default());
+            .unwrap_or_default();
 
         Ok((ink_rect, logical_rect))
     }