Bug 36627: (QA follow-up): Rename borrowernumber -> patron_id

To test:
$ prove t/db_dependent/api/v1/erm_counter_logs.t

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

Koha/ERM/EUsage/CounterLog.pm

@@ -31,6 +31,18 @@ Koha::ERM::EUsage::CounterLog - Koha ErmCounterLog Object class
 
 =cut
 
+=head3 to_api_mapping
+
+This method returns the mapping for representing a Koha::ERM::EUsage::CounterLog
+on the API.
+
+=cut
+
+sub to_api_mapping {
+    return {
+        borrowernumber => 'patron_id',
+    };
+}
 
 =head3 patron
 

api/v1/swagger/definitions/erm_counter_log.yaml

@@ -10,8 +10,8 @@ properties:
     type:
     - integer
     - "null"
-  borrowernumber:
-    description: borrowernumber of the counter log
+  patron_id:
+    description: patron_id of the counter log
     type:
     - integer
     - "null"
@@ -43,5 +43,5 @@ properties:
 additionalProperties: false
 required:
   - filename
-  - borrowernumber
+  - patron_id
   - counter_files_id