Resolve URLs for image assets

Makes no difference with Qt5, but required by Qt6.

src/data/contents/ui/MainPage.qml

@@ -238,7 +238,7 @@ Kirigami.ScrollablePage {
                 delegate: Kirigami.Card {
                     id: listItem
                     banner {
-                        source: img
+                        source: Qt.resolvedUrl(img)
                         title: title
                         titleAlignment: Qt.AlignBottom | Qt.AlignLeft
                     }

src/data/contents/ui/gallery/CardsGridViewGallery.qml

@@ -55,7 +55,7 @@ Kirigami.ScrollablePage {
     Component.onCompleted: {
         for (var i = 0; i < 50; ++i) {
             mainModel.append({"title": "Item " + i,
-                "image": "../banner.jpg",
+                "image": Qt.resolvedUrl("../banner.jpg"),
                 "text": "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam id risus id augue euismod accumsan. Nunc vestibulum placerat bibendum.",
                 "actions": [{text: "Action 1", icon: "add-placemark"},
                             {text: "Action 2", icon: "address-book-new-symbolic"}]

src/data/contents/ui/gallery/CardsLayoutGallery.qml

@@ -80,7 +80,7 @@ Kirigami.ScrollablePage {
                     }
                 ]
                 banner {
-                    source: "../banner.jpg"
+                    source: Qt.resolvedUrl("../banner.jpg")
                     title: qsTr("Card")
                 }
                 contentItem: Controls.Label {
@@ -118,7 +118,7 @@ Kirigami.ScrollablePage {
                     }
                 ]
                 banner {
-                    source: "../banner.jpg"
+                    source: Qt.resolvedUrl("../banner.jpg")
                     title: "Title Alignment"
                     titleAlignment: Qt.AlignLeft | Qt.AlignBottom
                 }
@@ -156,7 +156,7 @@ Kirigami.ScrollablePage {
             }
 
             Kirigami.Card {
-                banner.source: "../banner.jpg"
+                banner.source: Qt.resolvedUrl("../banner.jpg")
 
                 header: Rectangle {
                     color: Qt.rgba(0,0,0,0.3)
@@ -215,7 +215,7 @@ Kirigami.ScrollablePage {
                     }
                 ]
                 banner {
-                    source: "../banner.jpg"
+                    source: Qt.resolvedUrl("../banner.jpg")
                     title: "Title"
                 }
                 contentItem: Controls.Label {