[Seaside] WADateSelector FIX

[Dmitry Dorofeev]

Hi all,

Hopefully i found a bug and fixed it.
It was impossible to choose some dates (like 31 December and many others) 
becouse of incorrect month validation.

Menu for months is generated as 1 to: 12
but month check was >=0 and < 12.

fix is attached.

-Dmitry.
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'From Squeak3.8 of ''5 May 2005'' [latest update: #6665] on 31 August 2005 at 1:20:54 pm'!

!WADateSelector methodsFor: 'as yet unclassified' stamp: 'DVD 8/31/2005 13:18'!
privateIsValidDay: theDay monthNumber: theMonth year: theYear
	| maxDay |
	theMonth > 0 & (theMonth <= 12) ifFalse: [^false].
	maxDay := Month daysInMonth: theMonth forYear: theYear.
	^theDay > 0 & (theDay <= maxDay)! !