`fieldheatmap` doesn't work with GL quadrature

## Describe the bug
`fieldheatmap` can be used with a space that uses a GLL quadrature, but with a GL quadrature it brings up an empty figure that never gets fiiled.

## To Reproduce
```julia
using ClimaCore: Quadratures, CommonSpaces, Fields
using ClimaCoreMakie
using GLMakie

# Create a space with 1 quadrature point (npolynomial = 0)
radius = 6.371e6
h_elem = 6
n_quad_points = 1
quad = Quadratures.GL{n_quad_points}()
space1 = CommonSpaces.CubedSphereSpace(; radius, n_quad_points, h_elem, quad)

# Try to plot the latitude field (makes an empty plot)
lat1 = Fields.coordinate_field(space1).lat
fieldheatmap(lat1)

# Create a space with 2 quadrature points (npolynomial = 1)
n_quad_points = 2
quad = Quadratures.GLL{n_quad_points}()
space2 = CommonSpaces.CubedSphereSpace(; radius, n_quad_points, h_elem, quad)

# Try to plot the latitude field (works)
lat2 = Fields.coordinate_field(space2).lat
fieldheatmap(lat2)
```

## Project summary
```julia
(ClimaCore) pkg> st
Project ClimaCore v0.14.43
Status `~/clima/ClimaCore.jl/Project.toml`
[79e6a3ab] Adapt v4.4.0
[aae01518] BandedMatrices v1.10.2
[8e7c35d0] BlockArrays v1.9.3
[3a4d1b5c] ClimaComms v0.6.10
[908f55d8] ClimaCoreMakie v0.4.6
[7445602f] CubedSphere v0.3.4
[864edb3b] DataStructures v0.19.3
[f6369f11] ForwardDiff v1.3.0
⌅ [e9467ef8] GLMakie v0.10.18
[d54b0c1a] GaussQuadrature v0.5.8
[88fa7841] GilbertCurves v0.1.0
[f67ccb44] HDF5 v0.17.2
[8197267c] IntervalSets v0.7.13
⌅ [0b1a1467] KrylovKit v0.8.3
[9dccce8e] LazyBroadcast v1.0.0
[c3c07f87] MultiBroadcastFusion v0.3.3
[5da4648a] NVTX v1.0.1
[eebad327] PkgVersion v0.3.3
⌃ [731186ca] RecursiveArrayTools v3.36.0
[7181ea78] RootSolvers v1.0.0
[90137ffa] StaticArrays v1.9.15
[10745b16] Statistics v1.11.1
[0fe1646c] UnrolledUtilities v0.1.9
[b77e0a4c] InteractiveUtils v1.11.0
[37e2e46d] LinearAlgebra v1.11.0
[2f01184e] SparseArrays v1.11.0
```

## System details
```julia
julia> versioninfo()
Julia Version 1.11.6
Commit 9615af0f269 (2025-07-09 12:58 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: macOS (arm64-apple-darwin24.0.0)
CPU: 10 × Apple M1 Pro
WORD_SIZE: 64
LLVM: libLLVM-16.0.6 (ORCJIT, apple-m1)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)
Environment:
JULIA_PKG_SERVER_REGISTRY_PREFERENCE = eager
```