Fix kotlin annotation processing after java_plugin

I37c1e80eba71ae2d6a06199fb102194a51994989 broke kotlin annotation
processing with a typo in the processors flag to kapt and by
passing -processor to javac with an empty processorpath.

Bug: 77284273
Bug: 122251693
Test: kotlin_test.go
Test: m checkbuild
Change-Id: I17c45d5b3f9df089231af5d2930646ad0e6bf9be