internal/core/adt: remove diff/todo for fixed issues

These issues were fixed without removing
the corresponding TODO.

Signed-off-by: Marcel van Lohuizen <[email protected]>
Change-Id: If79ba9145ec76785961544d17a4b0a0f7a4e1b26
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1212145
Reviewed-by: Matthew Sackman <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>

Author: mpvl

Diff for: cue/testdata/comprehensions/issue3763.txtar

@@ -179,8 +179,6 @@ diff old new
      B: (#list){
      }
    }
--- diff/todo/p1 --
-full.ports|reduced.B: incomplete value (list)
 -- out/eval --
 (struct){
   full: (struct){