fix methodoflines tests

[xtalax]

[xtalax]

@ChrisRackauckas burgers should be working, it seems that the analytic funcs for the PDESystemLibrary being generated at precompile time means that RuntimeGeneratedFunctions can't find the function body in the cache dict at runtime so the full test runs but doesn't display any plots

[xtalax]

@ChrisRackauckas @shashi The functions are generated inside MTK with build_function, but are stored in a precompiled variable in PDESystemLibrary, Does symbolics also support passing cache and context down? What would these be in this case?

From the RuntimeGeneratedFunctions readme:

[ChrisRackauckas]

@YingboMa do you remember what was done for this?

[YingboMa]

By passing in eval_module like https://github.com/SciML/DiffEqProblemLibrary.jl/blob/bf3b582c3aaef62da3a71f298216b2a9f15218d2/lib/ODEProblemLibrary/src/ode_simple_nonlinear_prob.jl#L58C1-L59C1