Harmonize type of Tadirah-Types

[KlausIllmayer]

Usually the type-attribute is "object" and "technique" (e.g. SSK_sc_linguisticAnnotationOfCorpora), but there is also "objects" and "techniques" (e.g. SSK_sc_laserconservationrestoration, SSK_sc_LIBS).
Harmonize as defined in the guidelines.