Input Settings: drop the pointer role choice

The hand role the pointer takes isn't something to choose by hand. The
helper still reads POINTER_ROLE (right by default) for experiments.

Tried and reverted (not committed): in gaze mode, taking the stylus role
by reconnecting. SteamVR gave the device no role at all (hint 5, role
none) and kept the dashboard laser on the held controllers, so the mouse
couldn't click either. The dashboard laser needs a hand role, and a held
Frame controller takes its hand's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

input-settings/main.qml

@@ -842,28 +842,6 @@ Kirigami.ApplicationWindow {
                     opacity: 0.7
                     font: Kirigami.Theme.smallFont
                 }
-                ColumnLayout {
-                    Kirigami.FormData.label: "Pointer takes the role:"
-                    Repeater {
-                        model: backend.pointerRoles
-                        delegate: Controls.RadioButton {
-                            required property var modelData
-                            text: modelData.text
-                            checked: backend.pointerRole === modelData.value
-                            onToggled: if (checked) backend.setPointerRole(modelData.value)
-                        }
-                    }
-                }
-                Controls.Label {
-                    Layout.maximumWidth: Kirigami.Units.gridUnit * 30
-                    wrapMode: Text.WordWrap
-                    text: "A controller in your hand takes that hand's role, and then the pointer's clicks don't land. "
-                          + "Holding the right controller as the precision tool, give the pointer the left hand, or the "
-                          + "stylus role. It applies the next time the pointer wakes."
-                    opacity: 0.7
-                    font: Kirigami.Theme.smallFont
-                }
-
                 Kirigami.Separator { Kirigami.FormData.isSection: true; Kirigami.FormData.label: "Key combinations" }
 
                 Repeater {