corrected logo image view dimensions and added missing constraints
corrected logo image view dimensions and added missing constraints

ShengQiangLiu/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,rolson/arcgis-runtime-samples-ios,Natoto/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,sugar2010/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,Esri/arcgis-runtime-samples-ios,benstoltz/arcgis-runtime-samples-ios,sugar2010/arcgis-runtime-samples-ios,Natoto/arcgis-runtime-samples-ios,benstoltz/arcgis-runtime-samples-ios,ShengQiangLiu/arcgis-runtime-samples-ios