Stochastic DFT iter_header borrowed from Diagonalization ks_solver

[Cstandardlib]

Describe the Code Quality Issue

When performing sDFT computations without diagonalization, the SCF iter header is the same as KSDFT ks_solver:

// abacus-develop/source/source_estate/elecstate_print.cpp
    std::map<std::string, std::string> iter_header_dict
        = {{"cg", "CG"},
           {"cg_in_lcao", "CG"},
           {"lapack", "LA"},
           {"genelpa", "GE"},
           {"elpa", "EL"},
           {"dav", "DA"},
           {"dav_subspace", "DS"},
           {"scalapack_gvx", "GV"},
           {"cusolver", "CU"},
           {"bpcg", "BP"},
           {"pexsi", "PE"},
           {"cusolvermp", "CM"}}; 

Maybe the title should be changed into something else?

Additional Context

No response

Task list for Issue attackers (only for developers)

• Identify the specific code file or section with the code quality issue.
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• Refactor the code to improve code quality, following the suggested solution.
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• Update any relevant documentation, if necessary.
• Submit a pull request with the refactored code and a description of the changes made.