renderer: remove unused surface parameter from updateFrame

src/renderer/Thread.zig

@@ -605,7 +605,6 @@ fn renderCallback(
 
     // Update our frame data
     t.renderer.updateFrame(
-        t.surface,
         t.state,
         t.flags.cursor_blink_visible,
     ) catch |err|

src/renderer/generic.zig

@@ -1027,12 +1027,9 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
         /// Update the frame data.
         pub fn updateFrame(
             self: *Self,
-            surface: *apprt.Surface,
             state: *renderer.State,
             cursor_blink_visible: bool,
         ) !void {
-            _ = surface;
-
             // Data we extract out of the critical area.
             const Critical = struct {
                 bg: terminal.color.RGB,