Add braces to C++ single-line loops and conditionals (NFC) (#2973)

This makes code easier to read and more consistent between C++ and Java.
Also update clang-format settings to always add a line break (even if no braces are used).

wpilibcExamples/src/main/cpp/examples/RamseteController/cpp/Drivetrain.cpp

@@ -31,4 +31,6 @@ void Drivetrain::ResetOdometry(const frc::Pose2d& pose) {
   m_odometry.ResetPosition(pose, m_gyro.GetRotation2d());
 }
 
-frc::Pose2d Drivetrain::GetPose() const { return m_odometry.GetPose(); }
+frc::Pose2d Drivetrain::GetPose() const {
+  return m_odometry.GetPose();
+}

wpilibcExamples/src/main/cpp/examples/RamseteController/cpp/Robot.cpp

@@ -82,5 +82,7 @@ class Robot : public frc::TimedRobot {
 };
 
 #ifndef RUNNING_FRC_TESTS
-int main() { return frc::StartRobot<Robot>(); }
+int main() {
+  return frc::StartRobot<Robot>();
+}
 #endif