[Seaside] WAComponent class>>applicationClass fix

[Boris Popov]

Looks like #applicationClass wasn't called anymore to allow subclasses
to override the application, so changed hardcoded WAApplication to a
call site here,

applicationNamed: aString
 | application |
 application := self applicationClass named: aString.
 application configuration addAncestor: WARenderLoopConfiguration new.
 application preferenceAt: #rootComponent put: self.
 ^application

This is based on VisualWorks 2.7b1.5.1, it might be fixed in the Squeak
stream already.

Cheers!

-Boris

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