Wire the Remove cutaway button

Clears the cutaway from the shot so it is not cut into the film. The subject
stays, so Make cutaway can try again with a different draw.

script.html

@@ -720,6 +720,26 @@ function wire(locked) {
     });
   });
 
+  // Throwing a cutaway away. The picture is drawn from the writer's guess at
+  // what the line is about, so a wrong one is common and there was no way to
+  // get rid of it - only to redraw and hope.
+  [].forEach.call(document.querySelectorAll("[data-brollrm]"), function (b) {
+    b.addEventListener("click", async function () {
+      hideMsg("msg");
+      var idx = parseInt(b.getAttribute("data-brollrm"), 10);
+      b.disabled = true; b.textContent = "Removing…";
+      var r = await api("update_shot", { email: email, project_id: pid,
+                                         index: idx, broll_clear: true });
+      if (!r.ok) {
+        b.disabled = false; b.textContent = "Remove cutaway";
+        showMsg("msg", r.error || "Could not remove that.");
+        return;
+      }
+      showMsg("msg", "Cutaway removed from shot " + idx + ".", "ok");
+      load();
+    });
+  });
+
   [].forEach.call(document.querySelectorAll("[data-broll]"), function (b) {
     b.addEventListener("click", async function () {
       hideMsg("msg");