Indicator ThreeLevelCombined unified for all TreeMeshes (trixi-framework#2115)

* Unify Indicator 3-Level Combined TreeMesh

* fmt

---------

Co-authored-by: Hendrik Ranocha <[email protected]>

Author: DanielDoehring

src/callbacks_step/amr_dg1d.jl

@@ -291,7 +291,7 @@ function create_cache(::Type{ControllerThreeLevel}, mesh::TreeMesh{1}, equations
     return (; controller_value)
 end
 
-function create_cache(::Type{ControllerThreeLevelCombined}, mesh::TreeMesh{1},
+function create_cache(::Type{ControllerThreeLevelCombined}, mesh::TreeMesh,
                       equations, dg::DG, cache)
     controller_value = Vector{Int}(undef, nelements(dg, cache))
     return (; controller_value)

src/callbacks_step/amr_dg2d.jl

@@ -578,10 +578,4 @@ function create_cache(::Type{ControllerThreeLevel},
     controller_value = Vector{Int}(undef, nelements(dg, cache))
     return (; controller_value)
 end
-
-function create_cache(::Type{ControllerThreeLevelCombined}, mesh::TreeMesh{2},
-                      equations, dg::DG, cache)
-    controller_value = Vector{Int}(undef, nelements(dg, cache))
-    return (; controller_value)
-end
 end # @muladd