gui/event-widget: Use AdwClamp

AdwSqueezer is deprecated.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/587>

src/gui/gcal-event-widget.blp

@@ -35,12 +35,10 @@ template $GcalEventWidget: Widget {
       "content",
     ]
 
-    Adw.Squeezer squeezer {
-      hexpand: false;
-      homogeneous: false;
+    Adw.Clamp clamp {
       orientation: vertical;
 
-      Box vertical_box {
+      child: Box vertical_box {
         visible: bind $get_vertical_enabled(template.event, template.orientation) as <bool>;
         orientation: vertical;
 
@@ -66,7 +64,7 @@ template $GcalEventWidget: Widget {
           min-lines: 1;
           text-overflow: ellipsize_end;
         }
-      }
+      };
 
       Box horizontal_box {
         spacing: 4;

src/gui/gcal-event-widget.c

@@ -56,7 +56,6 @@ struct _GcalEventWidget
   GtkWidget          *timestamp_label;
   GtkWidget          *edge;
   GtkWidget          *overflow_bin;
-  GtkWidget          *squeezer;
   GtkWidget          *summary_inscription;
   GtkWidget          *vertical_box;
   GtkEventController *drag_source;
@@ -886,7 +885,6 @@ gcal_event_widget_class_init (GcalEventWidgetClass *klass)
   gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, edge);
   gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, overflow_bin);
   gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, timestamp_label);
-  gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, squeezer);
   gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, summary_inscription);
   gtk_widget_class_bind_template_child (widget_class, GcalEventWidget, vertical_box);