imgclock: Fix memory/interval leak when LCD turns on

apps.json

@@ -168,7 +168,7 @@
     "name": "Image background clock",
     "shortName":"Image Clock",
     "icon": "app.png",
-    "version":"0.04",
+    "version":"0.05",
     "description": "A clock with an image as a background",
     "tags": "clock",
     "type" : "clock",

apps/imgclock/ChangeLog

@@ -3,3 +3,4 @@
 0.03: Add {msb:true} so that on new builds, color is correct for 16 bit
 0.04: Fix hour alignment for single digits
       Scaling for background images <240px wide
+0.05: Fix memory/interval leak when LCD turns on

apps/imgclock/app.js

@@ -65,7 +65,7 @@ Bangle.on('lcdPower',on=>{
   if (secondInterval) clearInterval(secondInterval);
   secondInterval = undefined;
   if (on) {
-    setInterval(draw,1000);
+    secondInterval = setInterval(draw,1000);
     draw();
   }
 });