Misconfiguration of the CUDA solver for Ceres

[Bob-Eric]

Ceres' CUDA solver supports only three dense solvers, which require the else statement to be removed.
Otherwise it will fall back to the default SPARSE_NORMAL_CHOLESKY linear solver, resulting in higher CPU usage.

VINS-Fusion-ROS2/vins/src/estimator/estimator.cpp

Line 1171 in af78d13

options.dense_linear_algebra_library_type = ceres::CUDA;