Add missing dependency on compose plugin in kapt rules

The kapt rule uses kotlincFlags but was not using kotlincDeps,
causing the rule to get the -Xplugin argument on the compose
compiler plugin jar, but not have a dependency on it.

Bug: 231222079
Test: TestKotlinCompose
Change-Id: I4c2cf30fb7d8cad4eededa29f67f4ffd459caa41

java/kotlin_test.go

@@ -325,6 +325,7 @@ func TestKotlinCompose(t *testing.T) {
 		java_library {
 			name: "withcompose",
 			srcs: ["a.kt"],
+			plugins: ["plugin"],
 			static_libs: ["androidx.compose.runtime_runtime"],
 		}
 
@@ -332,6 +333,10 @@ func TestKotlinCompose(t *testing.T) {
 			name: "nocompose",
 			srcs: ["a.kt"],
 		}
+
+		java_plugin {
+			name: "plugin",
+		}
 	`)
 
 	buildOS := result.Config.BuildOS.String()
@@ -346,6 +351,9 @@ func TestKotlinCompose(t *testing.T) {
 	android.AssertStringDoesContain(t, "missing compose compiler plugin",
 		withCompose.VariablesForTestsRelativeToTop()["kotlincFlags"], "-Xplugin="+composeCompiler.String())
 
+	android.AssertStringListContains(t, "missing kapt compose compiler dependency",
+		withCompose.Rule("kapt").Implicits.Strings(), composeCompiler.String())
+
 	android.AssertStringListDoesNotContain(t, "unexpected compose compiler dependency",
 		noCompose.Rule("kotlinc").Implicits.Strings(), composeCompiler.String())