fix parameters support

Author: joaquimg

src/NonLinearProgram/NonLinearProgram.jl

@@ -114,14 +114,20 @@ function MOI.supports_constraint(
     S<:Union{
         MOI.GreaterThan{Float64},
         MOI.LessThan{Float64},
-        # MOI.Interval{Float64},
         MOI.EqualTo{Float64},
-        MOI.Parameter{Float64},
     },
 }
     return true
 end
 
+function MOI.supports_constraint(
+    ::Form,
+    ::Type{MOI.VariableIndex},
+    ::Type{MOI.Parameter{Float64}},
+)
+    return true
+end
+
 function _add_leq_geq(
     form::Form,
     idx::MOI.ConstraintIndex,