Fixed FHI-aims minimal basis set read_eigenvalues bug.

When using the FHI-aims minimal basis set strange behavior was observed from read_number_of_bands where the number of Kohn-Sham states is larger than the number of basis functions. This occured when using the minimal basis set size setting and light numerical settings for some materials (e.g. Ca4Ta4). The # of Kohn-Sham (KS) states can get reduced before the FHI-aims program begins. We need to check if the number has been reduced and if so, return this number since it is the number of KS states that is actually used by the program when computing.