UI Configuration -> UI Cluster Configuration : Improve misleading duplicate "Web Application" field names

[vrindanayak]

"dcmuiDeviceClusterDevices": {
    "title": "Web Application",
    "description": "Select configured WebApps to used to access the corresponding devices",
    "type": "array",
    "items" : { "type": "string" },
    "format": "webApp"
},
"dcmuiClusterWebApp": {
    "title": "Web Application",
    "description": "Web Application with the class QIDO-RS",
    "type":  "string",
    "format": "webApp"
}