Safer way to commit in-progress changes in wxGrid.

In some cases the wxGrid would attempt to close the editor in
the middle of the d'tor, resulting in segfaults.

eeschema/dialogs/dialog_sym_lib_table.cpp

@@ -550,8 +550,8 @@ void DIALOG_SYMBOL_LIB_TABLE::moveDownHandler( wxCommandEvent& event )
 
 bool DIALOG_SYMBOL_LIB_TABLE::TransferDataFromWindow()
 {
-    // stuff any pending cell editor text into the table.
-    m_cur_grid->SaveEditControlValue();
+    // Commit any pending in-place edits and close the editor
+    m_cur_grid->DisableCellEditControl();
 
     if( !wxDialog::TransferDataFromWindow() || !verifyTables() )
         return false;

pcbnew/dialogs/dialog_fp_lib_table.cpp

@@ -582,7 +582,7 @@ private:
         int dialogRet = 0;
 
         // stuff any pending cell editor text into the table.
-        m_cur_grid->SaveEditControlValue();
+        m_cur_grid->DisableCellEditControl();
 
         if( verifyTables() )
         {