[HarfBuzz] Corner case wrt to repeating Malayalam vowel sign OO

[Cibu Johny (സിബു)]

When
​MALAYALAM ​
VOWEL SIGN OO is repeated after a consonant, third one is displayed
separately with a dotted circle. It should have behaved like the second OO
sign. Sample text: കോോോ

Screenshot of the issue:
​
**​

​If there is a imposed upper limit for the count of repeating vowel signs,
something close to 10 would be useful.​
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