Fix #115289: EEVEE-Next: Negative scale lights

There was code for ensuring correct handedness,
but it wasn't working since vec.xyz() doesn't return by reference.

source/blender/draw/engines/eevee_next/eevee_light.cc

@@ -238,7 +238,7 @@ float Light::point_radiance_get(const ::Light *la)
 void Light::debug_draw()
 {
 #ifndef NDEBUG
-  drw_debug_sphere(_position, influence_radius_max, float4(0.8f, 0.3f, 0.0f, 1.0f));
+  drw_debug_sphere(float3(_position), influence_radius_max, float4(0.8f, 0.3f, 0.0f, 1.0f));
 #endif
 }
 

source/blender/draw/engines/eevee_next/eevee_shader_shared.hh

@@ -749,10 +749,10 @@ struct LightData {
 #define _clipmap_origin_y object_mat[3][3]
   /** Aliases for axes. */
 #ifndef USE_GPU_SHADER_CREATE_INFO
-#  define _right object_mat[0].xyz()
-#  define _up object_mat[1].xyz()
-#  define _back object_mat[2].xyz()
-#  define _position object_mat[3].xyz()
+#  define _right object_mat[0]
+#  define _up object_mat[1]
+#  define _back object_mat[2]
+#  define _position object_mat[3]
 #else
 #  define _right object_mat[0].xyz
 #  define _up object_mat[1].xyz