Fix: Eevee: Float Curve node causes issues with compiled shader

This fixes a regression from rBa0edee712a79239133ff840f911f6416d4c41855.
Issue being the curve map not being initialized in the GPU shader function.

Fixes T95221

source/blender/nodes/shader/nodes/node_shader_curves.cc

@@ -344,6 +344,7 @@ static int gpu_shader_curve_float(GPUMaterial *mat,
 
   CurveMapping *cumap = (CurveMapping *)node->storage;
 
+  BKE_curvemapping_init(cumap);
   BKE_curvemapping_table_F(cumap, &array, &size);
   GPUNodeLink *tex = GPU_color_band(mat, size, array, &layer);