Update API text file format to include missing generic signature

Currently, API text file does not include type parameter list for
constructor item. This change reformats the api text file to include the
missing type parameter list, with respect to the change in the behavior
of metalava.

Test: m update-api
Bug: 269135125
Change-Id: I46d364291615eabe071eab2dfc28796448f3139e
1 file changed