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js: Reinstate a missing variable declaration

... and then decide there was no excuse for renaming the variable, so
now it has the same name it had before I started using
Window.requestAnimationFrame().

--- a/emcclib.js

+++ b/emcclib.js

@@ -200,16 +200,16 @@

         if (!timer_active) {

             timer_reference = performance.now();

             var frame = function(now) {

-                current_timer = null;

+                timer = null;

                 timer_callback((now - timer_reference) / 1000.0);

                 /* The callback may have deactivated the timer. */

                 if (timer_active) {

                     timer_reference = now;

-                    current_timer = window.requestAnimationFrame(frame);

+                    timer = window.requestAnimationFrame(frame);

                 }

             }

             timer_active = true;

-            current_timer = window.requestAnimationFrame(frame);

+            timer = window.requestAnimationFrame(frame);

         }

     },

@@ -221,9 +221,9 @@

     js_deactivate_timer: function() {

         if (timer_active) {

             timer_active = false;

-            if (current_timer !== null) {

-                window.cancelAnimationFrame(current_timer);

-                current_timer = null;

+            if (timer !== null) {

+                window.cancelAnimationFrame(timer);

+                timer = null;

             }

         }

     },

--- a/emccpre.js

+++ b/emccpre.js

@@ -90,6 +90,7 @@

 var midpoint_cache = [];

 // Variables used by js_activate_timer() and js_deactivate_timer().

+var timer = null;

 var timer_active = false;

 var timer_reference;