Component chooser: fix ugly border on macOS

eeschema/dialogs/dialog_choose_component_base.cpp

@@ -18,7 +18,7 @@ DIALOG_CHOOSE_COMPONENT_BASE::DIALOG_CHOOSE_COMPONENT_BASE( wxWindow* parent, wx
 	wxBoxSizer* bSizerMain;
 	bSizerMain = new wxBoxSizer( wxVERTICAL );
 	
-	m_splitter1 = new wxSplitterWindow( this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxSP_3D|wxSP_LIVE_UPDATE );
+	m_splitter1 = new wxSplitterWindow( this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxSP_LIVE_UPDATE );
 	m_splitter1->SetSashGravity( 0.9 );
 	m_splitter1->Connect( wxEVT_IDLE, wxIdleEventHandler( DIALOG_CHOOSE_COMPONENT_BASE::m_splitter1OnIdle ), NULL, this );
 	m_splitter1->SetMinimumPaneSize( 1 );

eeschema/dialogs/dialog_choose_component_base.fbp

@@ -147,7 +147,7 @@
                         <property name="show">1</property>
                         <property name="size"></property>
                         <property name="splitmode">wxSPLIT_VERTICAL</property>
-                        <property name="style">wxSP_3D|wxSP_LIVE_UPDATE</property>
+                        <property name="style">wxSP_LIVE_UPDATE</property>
                         <property name="subclass"></property>
                         <property name="toolbar_pane">0</property>
                         <property name="tooltip"></property>