Component 14 should not appear in prioritization form and prioritization tab excel export as well

[samshara]

feedback from @steph-gm

Production - Prioritization form:
• Component 14 should not appear in the list to prioritize. It should behave like in the Assessment form (Component 14 has no rating in the assessment).

Originally posted by @tovari in IFRCGo/go-web-app#340 (comment)

feedback from @steph-gm:

Proritization tab:
• Component 14 as itself should not appear. This is linked to a situation to be fixed that I detail in the last point (Prioritization form in Production), because 14 has no rating or should be selected in prioritization.

Originally posted by @tovari in IFRCGo/go-web-app#447 (comment)