Remove record_tag_helper

It was only used in one place, and could easily be replaced.

Note we usually use HTML classes like `map-location` instead of
`map_location`, but I've kept the underscore for compatibility with the
previous version.

Gemfile

@@ -41,7 +41,6 @@ gem "paperclip", "~> 5.2.1"
 gem "paranoia", "~> 2.4.1"
 gem "pg", "~> 0.21.0"
 gem "pg_search", "~> 2.0.1"
-gem "record_tag_helper", "~> 1.0"
 gem "redcarpet", "~> 3.4.0"
 gem "responders", "~> 2.4.0"
 gem "rinku", "~> 2.0.2", require: "rails_rinku"

Gemfile.lock

@@ -385,8 +385,6 @@ GEM
     rake (12.3.2)
     recipient_interceptor (0.2.0)
       mail
-    record_tag_helper (1.0.0)
-      actionview (~> 5.x)
     redcarpet (3.4.0)
     referer-parser (0.3.0)
     request_store (1.4.0)
@@ -591,7 +589,6 @@ DEPENDENCIES
   rails-assets-leaflet!
   rails-assets-markdown-it (~> 8.2.1)!
   recipient_interceptor (~> 0.2.0)
-  record_tag_helper (~> 1.0)
   redcarpet (~> 3.4.0)
   responders (~> 2.4.0)
   rinku (~> 2.0.2)

app/helpers/map_locations_helper.rb

@@ -26,9 +26,9 @@ module MapLocationsHelper
 
   def render_map(map_location, parent_class, editable, remove_marker_label, investments_coordinates=nil)
     map_location = MapLocation.new if map_location.nil?
-    map = content_tag_for :div,
-                          map_location,
-                          class: "map",
+    map = content_tag :div, "",
+                      id: dom_id(map_location),
+                      class: "map_location map",
                       data: prepare_map_settings(map_location, editable, parent_class, investments_coordinates)
     map += map_location_remove_marker(map_location, remove_marker_label) if editable
     map