Remove unnecessary CSS rule for form editor max width

[MAILPEOT-4029]

mailpoet/assets/css/src/components-form-editor/_block-editor.scss

@@ -16,12 +16,6 @@
   background-color: $color-white;
 }
 
-// Fix for fixed bar forms
-// This will prevent editor width to grow and push sidebar out of the screen
-.interface-interface-skeleton__editor {
-  max-width: 100%;
-}
-
 // Fix for settings toolbar placement in header
 .edit-post-header {
   flex-direction: row-reverse;