JobsetInputs: update schema to align with the API

`PUT /jobsets/{project-id}/{jobset-id}` expects a JSON object `inputs` which
maps a name to a name, a type, a value, and a boolean that enables emailing
responsible parties. However, `GET /jobsets/{project-id}/{jobset-id}` responds
with an object that doesn't contain a value, but does contain a jobsetinputalts
(which is old and should be unused).

This commit aligns the two by removing the old and unused `jobsetinputalts` from
the response and replaces it with `value`.

hydra-api.yaml

@@ -589,17 +589,15 @@ components:
         name:
           description: name of the input
           type: string
+        value:
+          description: value of the input
+          type: string
         type:
           description: type of input
           type: string
         emailresponsible:
           description: whether or not to email responsible parties
           type: boolean
-        jobsetinputalts:
-          type: array
-          description: ???
-          items:
-            type: string
 
     Jobset:
       type: object