Bug 1791155 [wpt PR 35927] - Update wpt metadata, a=testonly

wpt-pr: 35927
wpt-type: metadata

testing/web-platform/meta/compat/webkit-mask-box-enumeration.html.ini

+[webkit-mask-box-enumeration.html]
+  [webkitMaskBoxImage found on CSSStyleDeclaration]
+    expected: FAIL
+
+  [webkitMaskBoxImageOutset found on CSSStyleDeclaration]
+    expected: FAIL
+
+  [webkitMaskBoxImageRepeat found on CSSStyleDeclaration]
+    expected: FAIL
+
+  [webkitMaskBoxImageSlice found on CSSStyleDeclaration]
+    expected: FAIL
+
+  [webkitMaskBoxImageSource found on CSSStyleDeclaration]
+    expected: FAIL
+
+  [webkitMaskBoxImageWidth found on CSSStyleDeclaration]
+    expected: FAIL