Resolves: fdo#65569 dropdown list missing from built-in fpicker

regression since a8c2cb0e
the different ctors have different defaults around whether
they show the dropdown or not.

Change-Id: I3d1bb423c8a25b81ffb26981b63af7498f99e70a

fpicker/source/office/iodlg.src

@@ -120,6 +120,9 @@ ModalDialog DLG_FPICKER_EXPLORERFILE
         Pos = MAP_APPFONT ( 59 , 117 ) ;
         Size = MAP_APPFONT ( 159 , 12 ) ;
         Border = TRUE ;
+        DropDown = TRUE ;
+        AutoSize = TRUE ;
+        AutoHScroll = TRUE ;
     };
     FixedText FT_EXPLORERFILE_SHARED_LISTBOX
     {

svtools/source/control/inettbc.cxx

@@ -899,10 +899,12 @@ void SvtURLBox::Init(bool bSetDefaultHelpID)
         SetHelpId( ".uno:OpenURL" );
     EnableAutocomplete( sal_False );
 
-    SetText( String() );
+    SetText( OUString() );
 
     GetSubEdit()->SetAutocompleteHdl( LINK( this, SvtURLBox, AutoCompleteHdl_Impl ) );
     UpdatePicklistForSmartProtocol_Impl();
+
+    EnableAutoSize(GetStyle() & WB_AUTOSIZE);
 }
 
 SvtURLBox::~SvtURLBox()