**BUG**
Concise problem statement:
Circle doesn't have features to choose tracking on "TopLayer" or "ButtomLayer"
Steps to reproduce bug:
1. Draw a circle
2. Select it
Results:
Only silk layers and "Document" are presented in "Circle Properties"/"Layer"
Expected results:
Possibility to choose "TopLayer" and "ButtomLayer" to
Browser:
https://easyeda.com/editor#id=a40fe899562c406b8f8993ef89b30527|c11db984d9cb437a9628e3419347d87f|b819c2084d7b4082a1951072baeba978|35aa529fab334aaa813abdc8b84b9e33