Bug 1587368 - follow-up: Unbust some ccov builds that are still using old Rust. a=shlindi

MANUAL PUSH: bustage

servo/components/style/properties/longhands/box.mako.rs

@@ -53,7 +53,7 @@ ${helpers.single_keyword(
 >
 impl computed_value::T {
     pub fn is_absolutely_positioned(self) -> bool {
-        matches!(self, Self::Absolute | Self::Fixed)
+        matches!(self, computed_value::T::Absolute | computed_value::T::Fixed)
     }
 }
 </%helpers:single_keyword>

servo/components/style/values/computed/box.rs

@@ -64,7 +64,7 @@ pub enum Float {
 impl Float {
     /// Returns true if `self` is not `None`.
     pub fn is_floating(self) -> bool {
-        self != Self::None
+        self != Float::None
     }
 }