Remove workaround in getMappingsForSubjects

Not necessary anymore after gbv/jskos-server#221 was fixed.

src/client/utils.js

@@ -69,6 +69,7 @@ export async function getMappingsForSubjects(subjects) {
   const 
     toScheme = state.schemes.map(s => s.uri).join("|"), 
     cardinality = "1-to-1",
+    direction = "both",
     configs = [],
     limit = 500
   let current = []
@@ -79,19 +80,12 @@ export async function getMappingsForSubjects(subjects) {
     // Cutoff when maxLength is exceeded (or after last element)
     if (length >= maxLength || (subject === null && from.length)) {
       current = []
-      // This was originally a workaround for a bug in jskos-server.
-      // That bug (https://github.com/gbv/jskos-server/issues/219) is now fixed,
-      // however, there seem to be performance issues with direction=both, so we're keeping this for now.
-      // See: https://github.com/gbv/jskos-server/issues/221
-      // TODO: Adjust after performance issues are fixed.
-      ;["forward", "backward"].forEach(direction => {
-        configs.push({
-          from,
-          toScheme,
-          cardinality,
-          direction,
-          limit,
-        })
+      configs.push({
+        from,
+        toScheme,
+        cardinality,
+        direction,
+        limit,
       })
     }
     current.push(subject)