[Notifications] Check pause button when job is paused

To provide some more direct feedback that the job is paused and an easy to spot
place to click to resume.

I chose to check the button instead of changing the icon like is done in Media
Controller for more visual feedback. A job is also seldom paused so having it
more obvious when it is the case aids the user better.

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

@@ -229,7 +229,7 @@ ColumnLayout {
             PropertyChanges {
                 target: suspendButton
                 tooltip: i18ndc("plasma_applet_org.kde.plasma.notifications", "Resume paused job", "Resume")
-                iconSource: "media-playback-start"
+                checked: true
             }
             PropertyChanges {
                 target: progressBar