Remove unnecessary background components

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

src/gui/BasicComboBox.qml

@@ -94,8 +94,5 @@ ComboBox {
             verticalAlignment: Text.AlignVCenter
         }
         highlighted: clearComboBox.highlightedIndex === index
-        background: Rectangle {
-           color: clearStatusDelegate.highlighted || clearStatusDelegate.hovered ? palette.highlight : palette.base
-       }
     }
 }

src/gui/filedetails/FileDetailsPage.qml

@@ -218,9 +218,6 @@ Page {
             Layout.rightMargin: root.intendedPadding
 
             padding: 0
-            background: Rectangle {
-                color: palette.window
-            }
 
             NCTabButton {
                 svgCustomColorSource: "image://svgimage-custom-color/activity.svg"

src/gui/tray/ActivityActionButton.qml

@@ -40,10 +40,6 @@ AbstractButton {
         delay: Qt.styleHints.mousePressAndHoldInterval
         visible: root.toolTipText !== "" && root.hovered
         contentItem: EnforcedPlainTextLabel { text: customTextButtonTooltip.text }
-        background: Rectangle {
-            border.color: palette.dark
-            color: palette.toolTipBase
-        }
     }
 
     Component {

src/gui/tray/AutoSizingMenu.qml

@@ -3,11 +3,6 @@ import QtQuick.Controls 2.3
 import Style 1.0
 
 Menu {
-    background: Rectangle {
-        border.color: palette.dark
-        color: palette.base
-    }
-
     width: {
         var result = 0;
         var padding = 0;

src/gui/tray/NCToolTip.qml

@@ -27,8 +27,4 @@ ToolTip {
         wrapMode: Text.Wrap
         color: palette.toolTipText
     }
-    background: Rectangle {
-        border.color: palette.dark
-        color: palette.toolTipBase
-    }
 }

src/gui/tray/UserLine.qml

@@ -159,12 +159,6 @@ AbstractButton {
                 id: userMoreButtonMenu
                 closePolicy: Menu.CloseOnPressOutsideParent | Menu.CloseOnEscape
 
-                background: Rectangle {
-                    border.color: palette.dark
-                    color: palette.base
-                    radius: 2
-                }
-
                 MenuItem {
                     visible: model.isConnected && model.serverHasUserStatus
                     height: visible ? implicitHeight : 0
@@ -173,16 +167,6 @@ AbstractButton {
                     palette.windowText: Style.ncTextColor
                     hoverEnabled: true
                     onClicked: showUserStatusSelector(index)
-
-                    background: Item {
-                        height: parent.height
-                        width: parent.menu.width
-                        Rectangle {
-                            anchors.fill: parent
-                            anchors.margins: 1
-                            color: parent.parent.hovered ? palette.highlight : "transparent"
-                        }
-                    }
                 }
 
                 MenuItem {