ui: tape: prevent mislabeling tapes in changers

when labeling a tape in a changer, we pre-fill the label field with
the one from the barcode (if it exists). Letting the user change
the label here does not make much sense, since we assume that they are
the same (e.g. for move operations etc.)

So instead simply display the label to protect users from accidentally
changing it. If a user really needs to have a different label than the
suggested one, it's still possible on the cli.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/tape/window/LabelMedia.js

@@ -50,10 +50,12 @@ Ext.define('PBS.TapeManagement.LabelMediaWindow', {
 	{
 	    fieldLabel: gettext('Label'),
 	    name: 'label-text',
-	    xtype: 'proxmoxtextfield',
+	    xtype: 'pmxDisplayEditField',
+	    submitValue: true,
 	    allowBlank: false,
 	    cbind: {
 		value: '{label}',
+		editable: '{!label}',
 	    },
 	},
 	{