Remove LogItem member variable initialization

Hi Ron!

I'm experimenting with pull requests today since this will be an essential skill for suggesting changes to code. With this pull request I'm submitting a change to your project for you to review. If you like it then you can merge the change. I'm still working through the details of what happens next.

I forked the project and ran it in the simulator. I noticed that when I started to type in a new item the value in the field was still there and I had to delete it myself. I checked and saw that the fragment layout had hints for the edit controls. Then I observed that the fragment initialized the member variables so the hints weren't showing.

It didn't look like the code relied on the member variables being initialized when they were declared so the change is to remove the variable initialization so the hints are displayed.

Todd