Auto merge of #29684 - Loirooriol:corner-clipping-typos, r=mrobinson

Fix corner clipping typos in layout-2020

<!-- Please describe your changes on the following line: -->
inner_radii() had a minus sign that shouldn't be there.

And padding_edge_clip() and content_edge_clip() clearly need to to use
the padding_rect() and content_rect() instead of border_rect.

Tests:
  - css/css-backgrounds/background-clip-padding-box-with-border-radius.html
  - css/css-backgrounds/background-rounded-image-clip.html

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #29683 (GitHub issue number if applicable)

<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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components/layout_2020/display_list/mod.rs

@@ -379,7 +379,7 @@ impl<'a> BuilderForBoxFragment<'a> {
                         .to_physical(self.fragment.style.writing_mode)
                         .to_webrender(),
                 ),
-                self.border_rect,
+                *self.padding_rect(),
                 builder,
             )
         })
@@ -394,7 +394,7 @@ impl<'a> BuilderForBoxFragment<'a> {
                         .to_physical(self.fragment.style.writing_mode)
                         .to_webrender(),
                 ),
-                self.border_rect,
+                *self.content_rect(),
                 builder,
             )
         })
@@ -667,7 +667,7 @@ fn image_rendering(ir: style::computed_values::image_rendering::T) -> wr::ImageR
 
 /// Radii for the padding edge or content edge
 fn inner_radii(mut radii: wr::BorderRadius, offsets: units::LayoutSideOffsets) -> wr::BorderRadius {
-    radii.top_left.width -= -offsets.left;
+    radii.top_left.width -= offsets.left;
     radii.bottom_left.width -= offsets.left;
 
     radii.top_right.width -= offsets.right;

tests/wpt/metadata-layout-2020/css/css-backgrounds/background-clip-padding-box-with-border-radius.html.ini

@@ -1,2 +0,0 @@
-[background-clip-padding-box-with-border-radius.html]
-  expected: FAIL

tests/wpt/metadata-layout-2020/css/css-backgrounds/background-rounded-image-clip.html.ini

@@ -1,2 +0,0 @@
-[background-rounded-image-clip.html]
-  expected: FAIL