Fix pressing the play button sometimes going to follow mode (#11609)

### Related

* Part of #11585

### What

Fixes a bug where pressing the play button in some contexts sometimes
went to follow mode instead of playing mode.

---------

Co-authored-by: Andreas Reich <andreas@rerun.io>

Author: IsseW

crates/viewer/re_time_panel/src/time_control_ui.rs

@@ -155,7 +155,11 @@ You can also define your own timelines, e.g. for sensor time or camera frame num
             .on_hover_ui(|ui| UICommand::PlaybackTogglePlayPause.tooltip_ui(ui))
             .clicked()
         {
-            time_commands.push(TimeControlCommand::TogglePlayPause);
+            if matches!(time_ctrl.play_state(), PlayState::Playing) {
+                time_commands.push(TimeControlCommand::SetPlayState(PlayState::Paused));
+            } else {
+                time_commands.push(TimeControlCommand::SetPlayState(PlayState::Playing));
+            }
         }
     }