overlays: Use ellipse SDF for circles

rpcs3/Emu/RSX/Overlays/overlay_checkbox.cpp

@@ -99,7 +99,7 @@ namespace rsx::overlays
 		}
 
 		auto ellipse_part = std::make_unique<rounded_rect>();
-		auto circle_part = std::make_unique<rounded_rect>();
+		auto circle_part = std::make_unique<ellipse>();
 
 		ellipse_part->set_size(dim * 2, dim / 2);
 		ellipse_part->set_pos(0, dim / 4);

rpcs3/Emu/RSX/Overlays/overlay_slider.cpp

@@ -29,7 +29,7 @@ namespace rsx::overlays
 		// Base components
 		auto background = std::make_unique<rounded_rect>();
 		auto foreground = std::make_unique<rounded_rect>();
-		auto indicator = std::make_unique<rounded_rect>();
+		auto indicator = std::make_unique<ellipse>();
 		auto value_label = std::make_unique<label>();
 		auto min_label = std::make_unique<label>();
 		auto max_label = std::make_unique<label>();