widgets/info_graph_multi: use Adw.WrapBox for centered last row

src/settings/setting/widgets/InfoGraphMultiWidget.py

-from gi.repository import Gtk
+from gi.repository import Adw, Gtk
 from .BaseWidget import BaseWidget
 
 
@@ -14,22 +14,24 @@ class InfoGraphMultiWidget(BaseWidget):
         self.columns = setting.map.get('columns', 3) if setting.map else 3
 
     def create_row(self):
-        self.flow_box = Gtk.FlowBox(
-            homogeneous=True,
-            selection_mode=Gtk.SelectionMode.NONE,
+        self.wrap_box = Adw.WrapBox(
+            line_homogeneous=True,
+            natural_line_length=self.columns * 160,
+            justify=Adw.JustifyMode.NONE,
+            align=0.5,
             margin_start=6,
             margin_end=6,
             margin_top=6,
             margin_bottom=6,
-            row_spacing=6,
-            column_spacing=6
+            line_spacing=6,
+            child_spacing=6
         )
 
         self.row = Gtk.ListBoxRow(
             selectable=False,
             activatable=False
         )
-        self.row.set_child(self.flow_box)
+        self.row.set_child(self.wrap_box)
 
         return self.row
 
@@ -46,7 +48,8 @@ class InfoGraphMultiWidget(BaseWidget):
             orientation=Gtk.Orientation.VERTICAL,
             spacing=0,
             css_classes=["card"],
-            width_request=150
+            width_request=150,
+            hexpand=False
         )
 
         drawing_area = Gtk.DrawingArea()
@@ -152,7 +155,7 @@ class InfoGraphMultiWidget(BaseWidget):
 
             if name not in self.graphs:
                 card = self._create_graph_card(name)
-                self.flow_box.append(card)
+                self.wrap_box.append(card)
 
             graph = self.graphs[name]
             graph['history'].append(value)