Don't render constraint positions in tests

for constraint system, it's always SPECIAL anyway

compiler/testData/constraintSystem/severalVariables/simpleDependency.bounds

@@ -3,8 +3,8 @@ VARIABLES T P
 SUBTYPE T Int
 
 type parameter bounds:
-T <: kotlin.Int(SPECIAL)
-P <: kotlin.Int(COMPOUND_CONSTRAINT_POSITION(TYPE_BOUND_POSITION(1), SPECIAL)
+T <: kotlin.Int
+P <: kotlin.Int
 status:
 -hasCannotCaptureTypesError: false
 -hasConflictingConstraints: false