Standard actions initializer throws exception on legacy editor screens

[soraksh]

Environment

• Platform version: 7.2
• Client type: Web

Description of the bug

• Minimal reproducible example

1. Create legacy editor screen and add ProcActionsFrame there.
2. Try to use procActionsFrame.initializer().standard()

• Expected behavior

Standard actions initialized

• Actual behavior

com.haulmont.bpm.exception.BpmException: ProcActionsFrame.standard() must be used inside Window.Editor only
	at com.haulmont.bpm.gui.procactions.ProcActionsFrame$Initializer.standard(ProcActionsFrame.java:445)
...