The ornamental design for a moveablebarrier, as shown and described.
1.-2. Moveable Barrier
1.1 : Perspective
1.2 : Top
1.3 : Front
1.4 : Bottom
1.5 : Back
1.6 : Left
1.7 : Right
2.1 : Perspective
2.2 : Top
2.3 : Front
2.4 : Bottom
2.5 : Back
2.6 : Left
2.7 : Right
The broken line showing is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design. The break lines in the drawings indicate that the appearance of any portion of the moveable barrier between the break lines forms no part of the claimed design.