fix: Fix for slow counting of org units for search results.

Org units were retrieved from d2 and then counted, but can be counted in d2 and then the number retrieved instead.
This solves long load times for programs with large number of TEIs and org units.

app/src/main/java/org/dhis2/usescases/searchTrackEntity/SearchRepositoryImpl.java

@@ -937,6 +937,6 @@ public boolean canCreateInProgramWithoutSearch() {
     private boolean displayOrgUnit() {
         return d2.organisationUnitModule().organisationUnits()
                 .byProgramUids(Collections.singletonList(currentProgram))
-                .blockingGet().size() > 1;
+                .count().blockingGet() > 1;
     }
 }