Correct tab to spaces to fix formatting

Author: roderick-koehle

gtsam/gtsam.i

@@ -2360,12 +2360,12 @@ class Values {
                  gtsam::Cal3Bundler,
                  gtsam::Cal3Fisheye,
                  gtsam::Cal3Unified,
-		 gtsam::EssentialMatrix,
+                 gtsam::EssentialMatrix,
                  gtsam::PinholeCameraCal3_S2,
                  gtsam::PinholeCameraCal3Bundler,
                  gtsam::PinholeCameraCal3Fisheye,
                  gtsam::PinholeCameraCal3Unified,
-		 gtsam::imuBias::ConstantBias,
+                 gtsam::imuBias::ConstantBias,
                  gtsam::NavState,
                  Vector,
                  Matrix,