Ensure floated dictionaries are in scope (again)
In the Specialiser, we missed one more call to
bringFloatedDictsIntoScope
(see #21391 (closed)).
This omission led to #21689 (closed). The problem is that the call
to rewriteClassOps
needs to have in scope any dictionaries
floated out of the arguments we have just specialised.
Easy fix.