surface: issue a mode 2031 DSR report when reloading the config

[moni-dz]

Follow up to #3965

[moni-dz]

after digging further I saw:

ghostty/src/Surface.zig

Lines 1179 to 1184 in ecfca17

	self.io.queueMessage(.{
	.change_config = .{
	.alloc = self.alloc,
	.ptr = termio_config_ptr,
	},
	}, .unlocked);

doesn't this already send a report during

ghostty/src/termio/stream_handler.zig

Line 131 in ecfca17

self.surfaceMessageWriter(.{ .report_color_scheme = false });