Reduce spacing above the notification buttons.

Spacing is now the  same as space between lines in the text above.

Signed-off-by: Camila <hello@camila.codes>

src/gui/tray/ActivityItem.qml

@@ -62,7 +62,7 @@ MouseArea {
         anchors.leftMargin: Style.standardSpacing
         anchors.verticalCenter: parent.verticalCenter
 
-        spacing: 10
+        spacing: Style.activityContentSpace
 
         ActivityItemContent {
             id: activityContent

src/gui/tray/ActivityItemContent.qml

@@ -106,11 +106,11 @@ RowLayout {
     Column {
         id: activityTextColumn
 
-        Layout.topMargin: 4
+        Layout.topMargin: Style.activityContentSpace
         Layout.fillWidth: true
         Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter
 
-        spacing: 4
+        spacing: Style.activityContentSpace
 
         Label {
             id: activityTextTitle

theme/Style/Style.qml

@@ -97,6 +97,8 @@ QtObject {
 
     readonly property var fontMetrics: FontMetrics {}
 
+    readonly property int activityContentSpace: 4
+
     function variableSize(size) {
         return size * (1 + Math.min(pixelSize / 100, 1));       
     }