Minor dialog cleanup.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20047

pcbnew/zone_manager/dialog_zone_manager_base.cpp

@@ -99,7 +99,7 @@ DIALOG_ZONE_MANAGER_BASE::DIALOG_ZONE_MANAGER_BASE( wxWindow* parent, wxWindowID
 	m_sdbSizer->AddButton( m_sdbSizerCancel );
 	m_sdbSizer->Realize();
 
-	m_sizerBottom->Add( m_sdbSizer, 0, wxEXPAND, 5 );
+	m_sizerBottom->Add( m_sdbSizer, 0, wxEXPAND|wxALIGN_CENTER_VERTICAL, 5 );
 
 
 	m_MainBoxSizer->Add( m_sizerBottom, 0, wxBOTTOM|wxEXPAND|wxTOP, 5 );

pcbnew/zone_manager/dialog_zone_manager_base.fbp

@@ -674,7 +674,7 @@
             </object>
             <object class="sizeritem" expanded="false">
               <property name="border">5</property>
-              <property name="flag">wxEXPAND</property>
+              <property name="flag">wxEXPAND|wxALIGN_CENTER_VERTICAL</property>
               <property name="proportion">0</property>
               <object class="wxStdDialogButtonSizer" expanded="false">
                 <property name="Apply">0</property>

pcbnew/zone_manager/pane_zone_viewer.h

@@ -31,11 +31,14 @@
 #include <wx/window.h>
 #include <wx/panel.h>
 #include <wx/notebook.h>
+
 class wxDataViewCtrl;
 class PANEL_ZONE_GAL;
 class PCB_BASE_FRAME;
 class PANEL_ZONE_GAL_CONTAINER;
 class ROW_ICON_PROVIDER;
+
+
 class PANE_ZONE_VIEWER : public wxNotebook, public ZONE_SELECTION_CHANGE_NOTIFIER
 {
 public:
@@ -48,7 +51,6 @@ public:
 
     PANEL_ZONE_GAL* GetZoneGAL() const { return m_zoneGAL; }
 
-
 private:
     PCB_BASE_FRAME*                                    m_pcbFrame;
     std::unordered_map<int, PANEL_ZONE_GAL_CONTAINER*> m_zoneContainers;