Ensure POINT_SIZE takes effect

(cherry picked from commit 0cf57e1927e51c9061cc292a88985e33543dafff)

servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp

@@ -2415,7 +2415,7 @@ RendererCanvasRenderRD::RendererCanvasRenderRD() {
 		actions.renames["LIGHT_VERTEX"] = "light_vertex";
 		actions.renames["SHADOW_VERTEX"] = "shadow_vertex";
 		actions.renames["UV"] = "uv";
-		actions.renames["POINT_SIZE"] = "gl_PointSize";
+		actions.renames["POINT_SIZE"] = "point_size";
 
 		actions.renames["MODEL_MATRIX"] = "model_matrix";
 		actions.renames["CANVAS_MATRIX"] = "canvas_data.canvas_transform";
@@ -2463,6 +2463,7 @@ RendererCanvasRenderRD::RendererCanvasRenderRD() {
 		actions.usage_defines["NORMAL_MAP"] = "#define NORMAL_MAP_USED\n";
 		actions.usage_defines["LIGHT"] = "#define LIGHT_SHADER_CODE_USED\n";
 		actions.usage_defines["SPECULAR_SHININESS"] = "#define SPECULAR_SHININESS_USED\n";
+		actions.usage_defines["POINT_SIZE"] = "#define USE_POINT_SIZE\n";
 
 		actions.render_mode_defines["skip_vertex_transform"] = "#define SKIP_TRANSFORM_USED\n";
 		actions.render_mode_defines["unshaded"] = "#define MODE_UNSHADED\n";