Prefer package with class files to class with the same name

See comments in JvmDependenciesIndexImpl and in the test

 #KT-15464 Fixed

compiler/testData/compileKotlinAgainstCustomBinaries/innerClassPackageConflict2/library2/test/Boo/SubBoo/C.java

@@ -0,0 +1,5 @@
+package test.Boo.SubBoo;
+
+public class C {
+    public interface Nested {}
+}

compiler/testData/compileKotlinAgainstCustomBinaries/innerClassPackageConflict2/library2/test/Foo/Bar.java

@@ -0,0 +1,4 @@
+package test.Foo;
+
+public class Bar {
+}