1.9.3.0 related bugs

While we are still not officially switching to 1.9.3.0, I found some new bugs introduced in 1.9.3.0 (comparing to 1.9.2.6).

My system: macOS 10.12 My robocode version: 1.9.3.0

UI bug:

• current robot score shown in right sidebar (the blue line) is incorrect
• radar scan arc is not shown correctly when it doesn't turn sometimes (it should be shown as a line, but is actually shown as it were a few ticks ago, when the radar was still turning).