Fix one frame missing

As mStartFrame and mEndFrame was counted from 0 and totalFrame() was
calculated as a difference, there were always one frame missing and
the animation rescaled. This patch adds one to the total frames count.

issue: Samsung#527

src/lottie/lottiemodel.h

@@ -539,8 +539,8 @@ class Composition : public Object {
     {
         return long(frameAtPos(timeInSec / duration()));
     }
-    size_t totalFrame() const { return mEndFrame - mStartFrame; }
-    long   frameDuration() const { return mEndFrame - mStartFrame - 1; }
+    size_t totalFrame() const { return mEndFrame - mStartFrame + 1; }
+    long   frameDuration() const { return mEndFrame - mStartFrame; }
     float  frameRate() const { return mFrameRate; }
     size_t startFrame() const { return mStartFrame; }
     size_t endFrame() const { return mEndFrame; }

src/lottie/lottieparser.cpp

@@ -699,7 +699,7 @@ void LottieParserImpl::parseComposition()
     resolveLayerRefs();
     comp->setStatic(comp->mRootLayer->isStatic());
     comp->mRootLayer->mInFrame = comp->mStartFrame;
-    comp->mRootLayer->mOutFrame = comp->mEndFrame;
+    comp->mRootLayer->mOutFrame = comp->mEndFrame + 1;
 
     mComposition = sharedComposition;
 }