Disable this action which was not implemented in kmail akonadi

CCBUG: 341920

kmail/configuredialog/configuresecuritypage.cpp

@@ -265,6 +265,7 @@ SecurityPageComposerCryptoTab::SecurityPageComposerCryptoTab( QWidget * parent )
 {
     mWidget = new Ui::ComposerCryptoConfiguration;
     mWidget->setupUi( this );
+    mWidget->mStoreEncrypted->setEnabled(false);
     connect( mWidget->mEncToSelf, SIGNAL(toggled(bool)), this, SLOT(slotEmitChanged()) );
     connect( mWidget->mShowKeyApprovalDlg, SIGNAL(toggled(bool)), this, SLOT(slotEmitChanged()) );
     connect( mWidget->mAutoEncrypt, SIGNAL(toggled(bool)), this, SLOT(slotEmitChanged()) );