MFH: r461855

www/waterfox: remove incompatible FF57 fix after r461852

error[E0609]: no field for_non_inherited_property on type &mut values::computed::Context<'_>

--> objdir/toolkit/library/i686-unknown-freebsd/release/build/style-ca3e0643edd5022b/out/properties.rs:79382:25
 |

79382 | context.for_non_inherited_property =

|                         ^^^^^^^^^^^^^^^^^^^^^^^^^^

Reported by: pkg-fallout
Pointy hat to: jbeich (forgot to svn rm)
Approved by: ports-secteam blanket