fix mixer with zoom

src/canvas.cpp

@@ -419,7 +419,7 @@ void Canvas::stroke_draw()
         glm::vec2 bb_max(0, 0);
         for (int j = 0; j < 4; j++)
         {
-            auto p = (xy(m_mixer_sample.pos) + off_mix[j]  * glm::orientate2(-s.angle) + glm::vec2(0, 1)) / zoom;
+            auto p = (xy(m_mixer_sample.pos) + off_mix[j]  * glm::orientate2(-s.angle) + glm::vec2(0, 1));
             UV2[j] = p / sz;
             bb_min = glm::max({ 0, 0 }, glm::min(bb_min, p));
             bb_max = glm::min(sz, glm::max(bb_max, p));