Show "Input name" field only for analog inputs

In mythtv-setup, Input Connections configuration, show the
"Input name" selection only for cards with analog inputs.
This field is used to select for example between Composite,
S-Video or Component Video when a card has different inputs.
Note that for digital cards the same database field is used
to store the Delivery System.

mythtv/libs/libmythtv/videosource.cpp

@@ -3206,7 +3206,7 @@ CardInput::CardInput(const QString & cardtype, const QString & device,
         ds->setValue(CardUtil::GetDeliverySystemFromDB(_cardid));
         addChild(ds);
     }
-    else
+    else if (CardUtil::IsV4L(cardtype))
     {
         addChild(m_inputName);
     }