remove spurious escape sequence from inline shader code in SimpleRiftController

src/ACGL/HardwareSupport/SimpleRiftController.cc

@@ -479,7 +479,7 @@ const char *FS_SOURCE_TWO_TEXTURE = "#version 150 core\n\
             }\n\
         \n\
             // vector from the lens center to the current point:\n\
-            vec2  theta = (position - LensCenter) * ScaleIn;\n\ // Scales to [-1, 1]\n\
+            vec2  theta = (position - LensCenter) * ScaleIn; // Scales to [-1, 1]\n\
         \n\
             // scaled distance from the lens center:\n\
             float rSq = theta.x * theta.x + theta.y * theta.y;\n\