Revert "nav: use back chevron in more places"

hitbox is annoying atm

This reverts commit ea0e28d2c5.

damus/Views/CreateAccountView.swift

@@ -101,17 +101,6 @@ struct BackNav: View {
     }
 }
 
-struct BackNavBasic: View {
-    @Environment(\.dismiss) var dismiss
-    
-    var body: some View {
-        Image(systemName: "chevron.backward")
-        .onTapGesture {
-            self.dismiss()
-        }
-    }
-}
-
 extension View {
     func placeholder<Content: View>(
         when shouldShow: Bool,