Mark some preliminary InScript keyboards as complete

This CL marks the followin InScript keyboards as complete.
- Sinhala
- Tamil
- Bengali
- Telugu
- Marathi
- Kannada
- Malayalam

Bug: 6911143
Bug: 9978106
Bug: 10028755
Bug: 10028759
Bug: 10028772
Bug: 10029252
Bug: 10417006
Change-Id: I8873725c3f1c3e6cb7bbad96d15034e44c0a1f0b