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/library1/test/Boo.java

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

compiler/testData/compileKotlinAgainstCustomBinaries/innerClassPackageConflict2/library1/test/Foo.java

@@ -0,0 +1,6 @@
+package test;
+
+public class Foo {
+    public interface Nested {
+    }
+}