The ornamental design for a tensioncurtainrodsupport, as shown and described.
FIG. 1 is a front view of a tension curtain rod support showing my new design;
FIG. 2 is a rear view of the tension curtain rod support;
FIG. 3 is a left side view of the tension curtain rod support;
FIG. 4 is a right side view of the tension curtain rod support;
FIG. 5 is a top view of the tension curtain rod support; and,
FIG. 6 is a bottom view of the tension curtain rod support.
The broken lines shown in FIG. 2 depict portions of the tension curtain rod support that form no part of the claim. The broken line showing of a tension curtain rod in FIG. 3 depicts environmental structure and forms no part of the claimed design.