Use a button instead of a link to remove a marker

Using a button for interactive elements is better, as explained in
commit 5311daadf.

Since buttons with "type=button" do nothing by default, we no longer
need to call `preventDefault()` when clicking it.

app/components/shared/map_location_component.rb

@@ -33,14 +33,15 @@ class Shared::MapLocationComponent < ApplicationComponent
       t("proposals.form.map_remove_marker")
     end
 
-    def remove_marker_link_id
-      "remove-marker-link-#{dom_id(map_location)}"
+    def remove_marker_id
+      "remove-marker-#{dom_id(map_location)}"
     end
 
     def remove_marker
-      link_to remove_marker_label, "#",
-        id: remove_marker_link_id,
-        class: "map-location-remove-marker"
+      button_tag remove_marker_label,
+        id: remove_marker_id,
+        class: "map-location-remove-marker",
+        type: "button"
     end
 
     def data
@@ -52,7 +53,7 @@ class Shared::MapLocationComponent < ApplicationComponent
         map_tiles_provider: Rails.application.secrets.map_tiles_provider,
         map_tiles_provider_attribution: Rails.application.secrets.map_tiles_provider_attribution,
         marker_editable: editable?,
-        marker_remove_selector: "##{remove_marker_link_id}",
+        marker_remove_selector: "##{remove_marker_id}",
         marker_investments_coordinates: investments_coordinates,
         marker_latitude: map_location.latitude.presence,
         marker_longitude: map_location.longitude.presence