PageController*::service: remove unused libraryName variable

[vedgy]

Hopefully the code does not rely on the side effects of the removed call to DBHelper::getLibraryName().

If the call to DBHelper::getLibraryName() is useful, either the variable assignment should be removed or an explaining comment should be added.

[luisangelsm]

This is in other controllers too, it shouldn't be necessary, so I think we should remove it in all the controllers that don't use the library name and then test the server just in case.

[vedgy]

we should remove it in all the controllers that don't use the library name

Done. All other controllers use this variable. Only the PageController* source files don't need #include "db_helper.h" after the variable removal. Looks like there is lots of code duplication in the controllers :(

[luisangelsm]

Looking good, thanks.