Fix required capability for tests

Author: craigtaverner

x-pack/plugin/esql/qa/testFixtures/src/main/resources/views.csv-spec

@@ -1,5 +1,5 @@
 addressCountries
-require_capability: views_v1
+required_capability: views_v1
 
 FROM address_countries
 ;
@@ -37,7 +37,7 @@ count:long | country:keyword
 ;
 
 airportsCountries
-require_capability: views_v1
+required_capability: views_v1
 
 FROM airports_countries
 ;
@@ -78,7 +78,7 @@ count:long | country:text
 ;
 
 languagesCountries
-require_capability: views_v1
+required_capability: views_v1
 
 FROM languages_countries
 ;