Bug 36956: Allow all providers to be displayed in reports

This patch fixes an incorrect usage of the API which was only returning 20 results.

Test plan:
1) Go to ERM module and make sure you have more than 20 data providers stored in your database.
1) (Optional) Run the following command (k-t-d) to create 21 data providers:
  perl -MKoha::Database -e '
      my $schema = Koha::Database->schema;

      $schema->resultset("ErmUsageDataProvider")->create({
          name => "name ".$_
      }) for (1..21)
  '
2) Go to eUsage / reports and create new report (cgi-bin/koha/erm/eusage/reports)
3) Check that only the first 20 data providers are displayed in the drop down
4) Apply patch
5) yarn build or reset_all to rebuild the javascript
6) Repeat steps 1-3, all providers should now be displayed

PA amended patch: Updated commit message test plan

Signed-off-by: Michaela Sieber <michaela.sieber@kit.edu>
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 6afe1e14dc)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/vue/fetch/erm-api-client.js

@@ -263,7 +263,7 @@ export class ERMAPIClient extends HttpClient {
                     endpoint: "usage_data_providers/" + id,
                 }),
             getAll: query =>
-                this.get({
+                this.getAll({
                     endpoint: "usage_data_providers",
                     query,
                     query,