swrenderer: fix image drawing when the image is not stretched to the geometry

This would cause some of the image to be drawn outside of the clip
region, which may even lead to panics

(Fix changing pages in the energy-monitor demo)

internal/core/software_renderer.rs

@@ -1013,6 +1013,7 @@ impl<'a, T: ProcessScene> SceneBuilder<'a, T> {
 
         let renderer_clip_in_source_rect_space = (self.current_state.clip.cast()
             * self.scale_factor)
+            .translate(-image_fit_offset)
             .scale(1. / source_to_target_x, 1. / source_to_target_y);
         match image_inner {
             ImageInner::None => (),