applets/manage-inputmethod: only make it active in tablet mode

Outside of tablet mode, you don't need a virtual keyboard except for the
extremely niche case of not having a physical keyboard plugged into a
desktop machine. For all other use cases, the tray item to show and
hide the virtual keyboard is an annoyance when you're not in tablet
mode, so let's demote it to the expanded popup to save space in the
System Tray and make its contents more contextually relevant.

applets/manage-inputmethod/contents/ui/manage-inputmethod.qml

@@ -13,6 +13,7 @@ import org.kde.plasma.components 3.0 as PlasmaComponents3
 import org.kde.plasma.extras 2.0 as PlasmaExtras
 import org.kde.plasma.workspace.keyboardlayout 1.0 as Keyboards
 import org.kde.kquickcontrolsaddons 2.0
+import org.kde.kirigami 2.5 as Kirigami // For Settings.tabletMode
 
 Item {
     id: root
@@ -77,7 +78,8 @@ Item {
             PropertyChanges { target: plasmoid
                 icon: "arrow-down"
                 toolTipSubText: i18n("Virtual Keyboard: visible")
-                status: PlasmaCore.Types.ActiveStatus
+                // It's only relevant in tablet mode
+                status: Kirigami.Settings.tabletMode ? PlasmaCore.Types.ActiveStatus : PlasmaCore.Types.PassiveStatus
             }
             PropertyChanges { target: root; overlays: [] }
         },
@@ -87,7 +89,8 @@ Item {
             PropertyChanges { target: plasmoid
                 icon: "input-keyboard-virtual-on"
                 toolTipSubText: i18n("Virtual Keyboard: enabled")
-                status: PlasmaCore.Types.ActiveStatus
+                // It's only relevant in tablet mode
+                status: Kirigami.Settings.tabletMode ? PlasmaCore.Types.ActiveStatus : PlasmaCore.Types.PassiveStatus
             }
             PropertyChanges { target: root; overlays: [] }
         }