Fix Label valign position
Fix Label valign position

Fix #7055

(cherry picked from commit c0e87f2a248af48b22f414ecc00df2631a715eac)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1