Only show password validation errors in password change form

We're about to add another form to this page to allow the user to
change their email. Since that form will also act on the User model we
want to make sure that the relevant validation errors are shown on
each form. This form deals with errors on the password field so we add
a guard clause for those.

app/views/users/show.html.erb

@@ -10,7 +10,9 @@
         <% if flash[:incorrect_password] %>
           <%= render ErrorBoxComponent.new(title: 'Incorrect password').with_content(flash[:incorrect_password]) %>
         <% end %>
-        <%= render ModelErrorComponent.new(model: @user) %>
+        <% if @user.errors.include?(:password) %>
+          <%= render ModelErrorComponent.new(model: @user) %>
+        <% end %>
         <%= form.password_field :current_password, required: true, autofocus: true, autocomplete: "current-password", class: "w-full mb-3" %>
         <%= form.password_field :password, label: { text: "New password"}, required: true, autocomplete: "new-password", class: "w-full mb-3" %>
         <%= form.password_field :password_confirmation, label: { text: "Confirm new password"}, required: true, autocomplete: "new-password", class: "w-full mb-3" %>