Fixed non-functioning default value for CCUserDefault::getDoubleForKey()

- defaultValue was not being passed into the JNI CallStaticDoubleMethod
method previously.
-  CCUserDefault::getDoubleForKey() would return undefined garbage when
the key doesn’t exist.
Test Case:
Call the following from anywhere in your code (in release
configuration). X will be garbage.
Call the following from your code:
double x =
CCUserDefault::sharedUserDefault()->getDoubleForKey("Some-Non-existant-k
ey-1234", 0);
CCLOG("x = %4.2f", x);

Fix Tested on Android. Affects Android only.

cocos/2d/platform/android/jni/Java_org_cocos2dx_lib_Cocos2dxHelper.cpp

@@ -190,7 +190,7 @@ double getDoubleForKeyJNI(const char* pKey, double defaultValue)
     
     if (JniHelper::getStaticMethodInfo(t, CLASS_NAME, "getDoubleForKey", "(Ljava/lang/String;D)D")) {
         jstring stringArg = t.env->NewStringUTF(pKey);
-        jdouble ret = t.env->CallStaticDoubleMethod(t.classID, t.methodID, stringArg);
+        jdouble ret = t.env->CallStaticDoubleMethod(t.classID, t.methodID, stringArg, defaultValue);
         
         t.env->DeleteLocalRef(t.classID);
         t.env->DeleteLocalRef(stringArg);