PR# 19667 Prettify Class uglyfies agent literals

An agent literal has the space between feature name and left parentheses removed when the class is prettified.

Create a simple project with the root class below. Within EiffelStudio class editor, press Ctrl+Shift+P. Notice that the line

			f := agent foo (5, ?)

is changed into

			f := agent foo(5, ?)

---------------------------------------------
class
	APPLICATION

create
	make

feature {NONE}

	make
		local
			f: PREDICATE [INTEGER]
		do
			f := agent foo (5, ?)
			print (f (3))
		end

feature

	foo (i, j: INTEGER): BOOLEAN
		do
		end

end

Added eweasel test#pretty033.
Fixed in rev#104611 of EiffelStudio 20.11 intermediate release.