Update link in show_selected_herbarium_records
Update link in show_selected_herbarium_records

Fixes this Error:
```
ERROR["test_index_herbarium_record", #<Minitest::Reporters::Suite:0x00005594a4fcf880 @name="HerbariumRecordControllerTest">, 135.524148625]
 test_index_herbarium_record#HerbariumRecordControllerTest (135.52s)
Minitest::UnexpectedError:         ActionView::Template::Error: No route matches {:action=>"create_herbarium", :controller=>"herbaria"}
```

MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer,JoeCohen/mushroom-observer,MushroomObserver/mushroom-observer