fix(ios): report width/height of Blob as pixels, not points

With some sizes and scales, it is impossible to reconstruct the true number of pixels
in JS just with screen density/scale. We need to multiple image scale vs pts natively.
i.e. 10px square iumage on a 3x device reported width/height of 3, device scale of 3.
Multiplying in JS naively we'd get image size of 9px x 9px, which was incorrect.

Fixes TIMOB-27997

iphone/TitaniumKit/TitaniumKit/Sources/API/TiBlob.m

@@ -68,7 +68,7 @@ - (NSUInteger)width
 {
   [self ensureImageLoaded];
   if (image != nil) {
-    return image.size.width;
+    return image.size.width * image.scale;
   }
   return 0;
 }
@@ -78,7 +78,7 @@ - (NSUInteger)height
 {
   [self ensureImageLoaded];
   if (image != nil) {
-    return image.size.height;
+    return image.size.height * image.scale;
   }
   return 0;
 }
@@ -88,7 +88,7 @@ - (NSUInteger)size
 {
   [self ensureImageLoaded];
   if (image != nil) {
-    return image.size.width * image.size.height;
+    return image.size.width * image.size.height * image.scale * image.scale;
   }
   switch (type) {
   case TiBlobTypeData: {