Remove themed color from machinesettings action

Since it's partially in a system themed style, it shouldn't use color.
If it does use color, it gets messed up if the user uses dark theme (white text on
gray background doesn't work)

CURA-7059

plugins/MachineSettingsAction/MachineSettingsAction.qml

@@ -97,7 +97,6 @@ Cura.MachineAction
         text: Cura.MachineManager.activeMachine.name
         horizontalAlignment: Text.AlignHCenter
         font: UM.Theme.getFont("large_bold")
-        color: UM.Theme.getColor("text")
         renderType: Text.NativeRendering
     }