fix search for meaning on firefox

Author: timothypratley

src/civitas/why/village/traction.cljs

@@ -38,9 +38,9 @@
          ;; HACK: for some reason some slides bounding box is too tall
          ;;bbh (.-height bbt)
          bbh (/ bbw 1.1547)
-         bbm (-> (.getCTM svg)
+         bbm (-> (.getScreenCTM svg)
                  (.inverse)
-                 (.multiply (.getCTM target)))
+                 (.multiply (.getScreenCTM target)))
          top-left (pt*m bbx bby bbm)
          bottom-right (pt*m (+ bbx bbw) (+ bby bbh) bbm)
          x (.-x top-left)