Revert "Cvpcb: fix possible crash when pressing the ESC key during some calculations."

This reverts commit 99b242069d because it does
not fix all cases.

cvpcb/footprints_listbox.cpp

@@ -176,6 +176,7 @@ void FOOTPRINTS_LISTBOX::SetFootprints( FOOTPRINT_LIST& aList, const wxString& a
         selection = 0;
 
     DeselectAll();
+    wxSafeYield();
     wxWindowUpdateLocker freeze( this );
     DeleteAllItems();
 

cvpcb/readwrite_dlgs.cpp

@@ -85,14 +85,13 @@ bool CVPCB_MAINFRAME::ReadNetListAndFpFiles( const std::string& aNetlist )
     wxString        msg;
     bool            hasMissingNicks = false;
 
-    // Remark: *DO NOT* call wxSafeYield() or wxYield() during these calculations,
-    // because a Close event (generated by the ESC key) can close some widgets during
-    // refreshing them here, fired by the wxSafeYield() call.
     ReadSchematicNetlist( aNetlist );
 
     if( m_symbolsListBox == nullptr )
         return false;
 
+    wxSafeYield();
+
     LoadFootprintFiles();
 
     BuildFootprintsListBox();