Fix some alignments

Summary: This fixes some wrong alignments

Test Plan:
After:
{F8305161}
{F8305164}
{F8305166}

Reviewers: #vdg, #plasma, ngraham

Reviewed By: #vdg, ngraham

Subscribers: ndavis, abetts, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D29570

applets/batterymonitor/package/contents/ui/PowerManagementItem.qml

@@ -31,6 +31,7 @@ ColumnLayout {
 
     RowLayout {
         Layout.fillWidth: true
+        Layout.leftMargin: units.smallSpacing
 
         Components.CheckBox {
             id: pmCheckBox

applets/notifications/package/contents/ui/FullRepresentation.qml

@@ -64,11 +64,12 @@ PlasmaComponents3.Page {
 
     header: PlasmaExtras.PlasmoidHeading {
         ColumnLayout {
-            anchors.fill: parent
+            anchors {
+                fill: parent
+                leftMargin: units.smallSpacing
+            }
             id: header
             visible: !Kirigami.Settings.isMobile
-            Layout.fillWidth: true
-            Layout.leftMargin: units.smallSpacing
             spacing: 0
 
             RowLayout {

applets/systemtray/package/contents/ui/ExpandedRepresentation.qml

@@ -80,7 +80,7 @@ Item {
 
                     //applet open, sidebar
                     } else if (activeApplet && hiddenItemsView.visible && !LayoutMirroring.enabled) {
-                        return hiddenItemsView.width + units.largeSpacing;
+                        return hiddenItemsView.width + units.smallSpacing + dialog.margins.left;
 
                     //applet open, no sidebar
                     } else {