BUG: Re-fix issue #8682. Use new variable CPACK_NSIS_PACKAGE_NAME in appropriate places rather than CPACK_NSIS_DISPLAY_NAME. CPACK_NSIS_DISPLAY_NAME is the Add/Remove control panel's description string for the installed package. Using it as the "Name" of the NSIS installer package made the CMake installer itself use really long strings in the installer GUI. This fix still allows for the original intent of the first fix for #8682 -- the ability to separate the installer name from the default install directory, but it uses a new/different variable to achieve the separation.