Fix name related files in ca locale (faker-ruby#1878)

Summary of the changes:
* Remove redundant lines with the same content
* Remove #{prefix} as there is no such field for this locale

lib/locales/ca.yml

@@ -14,18 +14,10 @@ ca:
         - "#{female_prefix} #{female_first_name} #{last_name} #{last_name}"
         - "#{female_first_name} #{last_name} i #{last_name}"
         - "#{female_first_name} #{last_name} #{last_name}"
-        - "#{female_first_name} #{last_name} #{last_name}"
-        - "#{female_first_name} #{last_name} #{last_name}"
         - "#{male_prefix} #{male_first_name} #{last_name} #{last_name}"
         - "#{male_first_name} #{last_name} i #{last_name}"
         - "#{male_first_name} #{last_name} #{last_name}"
-        - "#{male_first_name} #{last_name} #{last_name}"
-        - "#{male_first_name} #{last_name} #{last_name}"
       name_with_middle:
-        - "#{prefix} #{first_name} #{last_name} #{last_name}"
-        - "#{first_name} #{last_name} #{last_name}"
-        - "#{first_name} #{last_name} #{last_name}"
-        - "#{first_name} #{last_name} #{last_name}"
         - "#{first_name} #{last_name} #{last_name}"
     color:
       name: [aiguamarina, albercoc, amarant, ambre, ametista, atzur, beix, bistre, blanc, blat, blau, blau cel, blau fosc, blau marí, blau reial, blauet, bronze, camussa, canyella, caqui, cardenal, carmesí, carmí, carnació, castany rogenc, celadont, ceruli, chartreuse, cian, cirera, corall, coure, crema, escarlata, granat, gris, gris fosc, groc, lavanda, lila, llima, magenta, malva, marró, morat, ocre, or, orquídia, panotxa, plata, porpra, préssec, pruna, verd, verd maragda, verd oliva, verd veronès, vermell, vermell fosc, vermelló, vinca, violat, vori]