style: cleanup generic form css override

app/assets/stylesheets/all_demarches.scss

@@ -1,4 +1,7 @@
 .sidebar-filter {
+  border: none;
+  padding-left: 0;
+
   ul {
     list-style: none;
     padding-inline-start: 0;

app/assets/stylesheets/dsfr.scss

@@ -85,17 +85,6 @@ input[type="radio"] {
   }
 }
 
-// remove pointer cursor on textarea
-textarea {
-  cursor: auto;
-}
-
-fieldset {
-  border: none;
-  padding-left: 0;
-  padding-bottom: 0;
-}
-
 .fr-btn.fr-btn--icon-left[target="_blank"] {
   &::after {
     display: none;

app/assets/stylesheets/forms.scss

@@ -401,6 +401,11 @@
     }
 
     &.editable-champ-repetition {
+      fieldset {
+        border: none;
+        padding-left: 0;
+      }
+
       .row {
         border-radius: 4px;
         border: 1px solid $border-grey;