Fix button rounding in mute settings

app/assets/stylesheets/overrides/_inputs.scss

@@ -29,3 +29,9 @@
 .form-check-input:focus {
   box-shadow: rgba(var(--primary-rgb), 0.25) 0 0 0 0.25rem;
 }
+
+.input-group .button_to .btn {
+  margin-left: -1px;
+  border-top-left-radius: 0px;
+  border-bottom-left-radius: 0px;
+}

app/views/settings/mutes/_form.html.haml

@@ -2,5 +2,4 @@
   %form{ action: settings_muted_path, method: "post" }
     .input-group
       %input.form-control#muted-phrase{ name: :muted_phrase, placeholder: t(".placeholder"), required: true, minlength: 1, data: { controller: :autofocus } }
-      .input-group-append
       %button.btn.btn-primary{ type: "submit" }= t("voc.add")

app/views/settings/mutes/_rule.html.haml

@@ -1,6 +1,5 @@
 .form-group.mb-3{ id: "rule_#{rule.id}" }
   .input-group
     %input.form-control{ disabled: true, value: rule.muted_phrase }
-    .input-group-append
     = button_to settings_muted_destroy_path(rule.id), method: :delete, class: "btn btn-danger" do
       = t("voc.remove")