Fix incorrect color fringe colors on SVG:s (#7069)

This is a problem that affected the fringes on all SVG:s with
transparency, especially on a light background.

## Before

![image](https://github.com/user-attachments/assets/342823ad-005c-4f82-83a6-d2dcccfd3221)


## After

![image](https://github.com/user-attachments/assets/73398265-d333-461b-8c2b-fce405d95a9c)

crates/egui_demo_lib/src/demo/demo_app_windows.rs

@@ -100,6 +100,7 @@ impl Default for DemoGroups {
                 Box::<super::tests::InputTest>::default(),
                 Box::<super::tests::LayoutTest>::default(),
                 Box::<super::tests::ManualLayoutTest>::default(),
+                Box::<super::tests::SvgTest>::default(),
                 Box::<super::tests::TessellationTest>::default(),
                 Box::<super::tests::WindowResizeTest>::default(),
             ]),

crates/egui_demo_lib/src/demo/tests/mod.rs

@@ -6,6 +6,7 @@ mod input_event_history;
 mod input_test;
 mod layout_test;
 mod manual_layout_test;
+mod svg_test;
 mod tessellation_test;
 mod window_resize_test;
 
@@ -17,5 +18,6 @@ pub use input_event_history::InputEventHistory;
 pub use input_test::InputTest;
 pub use layout_test::LayoutTest;
 pub use manual_layout_test::ManualLayoutTest;
+pub use svg_test::SvgTest;
 pub use tessellation_test::TessellationTest;
 pub use window_resize_test::WindowResizeTest;

crates/egui_demo_lib/src/demo/tests/svg_test.rs

@@ -0,0 +1,32 @@
+pub struct SvgTest {
+    color: egui::Color32,
+}
+
+impl Default for SvgTest {
+    fn default() -> Self {
+        Self {
+            color: egui::Color32::LIGHT_RED,
+        }
+    }
+}
+
+impl crate::Demo for SvgTest {
+    fn name(&self) -> &'static str {
+        "SVG Test"
+    }
+
+    fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
+        egui::Window::new(self.name()).open(open).show(ctx, |ui| {
+            use crate::View as _;
+            self.ui(ui);
+        });
+    }
+}
+
+impl crate::View for SvgTest {
+    fn ui(&mut self, ui: &mut egui::Ui) {
+        let Self { color } = self;
+        ui.color_edit_button_srgba(color);
+        ui.add(egui::Image::new(egui::include_image!("../../../data/peace.svg")).tint(*color));
+    }
+}