Fix Compat-MSExchange.ics unit test
Apparently it expects a "CLASS:PRIVATE" line.
480: Test timeout computed to be: 10000000
480: Input file: "/home/ahmad/dev/kcalendarcore/autotests/data/Compat/MSExchange.ics"
480: Output file: "/home/ahmad/dev/kcalendarcore/build/autotests/data/Compat/MSExchange.ics.ical.out"
480: ====================
480: Checking '/home/ahmad/dev/kcalendarcore/build/autotests/data/Compat/MSExchange.ics.ical.out':
480: --- /home/ahmad/dev/kcalendarcore/autotests/data/Compat/MSExchange.ics.ical.ref 2021-11-22 13:55:39.604172257 +0200
480: +++ /home/ahmad/dev/kcalendarcore/build/autotests/data/Compat/MSExchange.ics.ical.out 2021-11-22 13:55:56.824248192 +0200
480: @@ -65,6 +65,7 @@
480: LAST-MODIFIED:20031111T180554Z
480: SUMMARY:Bob Bond's staff
480: STATUS:TENTATIVE
480: +CLASS:PRIVATE
480: PRIORITY:5
480: RRULE:FREQ=WEEKLY;BYDAY=MO;WKST=SU
480: DTSTART;TZID=America/Tijuana:20031110T100000
480: Encountered 1 errors
1/1 Test #480: Compat-MSExchange.ics ............***Failed 0.06 sec
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