(core) JS error on creator panel and formula editor.

Summary:
Fixing js error that happens when closing creator panel with active formula editor.

Styling behavior menu with common styles.

Test Plan: Browser tests

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D3150

app/client/widgets/FieldBuilder.ts

@@ -522,7 +522,7 @@ export class FieldBuilder extends Disposable {
     editRow: DataRowModel,
     refElem: Element,
     editValue?: string,
-    onSave?: (formula: string) => Promise<void>,
+    onSave?: (column: ColumnRec, formula: string) => Promise<void>,
     onCancel?: () => void) {
     const editorHolder = openFormulaEditor({
       gristDoc: this.gristDoc,

app/client/widgets/FieldEditor.ts

@@ -383,7 +383,7 @@ export function openFormulaEditor(options: {
   // Element over which to position the editor.
   refElem: Element,
   editValue?: string,
-  onSave?: (formula: string) => Promise<void>,
+  onSave?: (column: ColumnRec, formula: string) => Promise<void>,
   onCancel?: () => void,
   // Called after editor is created to set up editor cleanup (e.g. saving on click-away).
   setupCleanup: (
@@ -401,7 +401,7 @@ export function openFormulaEditor(options: {
   const saveEdit = asyncOnce(async () => {
     const formula = editor.getCellValue();
     if (options.onSave) {
-      await options.onSave(formula as string);
+      await options.onSave(column, formula as string);
     } else if (formula !== column.formula.peek()) {
       await column.updateColValues({formula});
     }