Android: prevent browsing further than the root directory.

We must ensure that two LocalFile objects pointing to the same File
are equal so the check to decide if the application button means "up"
works.

Change-Id: Ib83b34a210eec9a3f038c27d27a4e9b305c98ef9
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/storage/local/LocalFile.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/storage/local/LocalFile.java
index 797d909..8e8115a 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/storage/local/LocalFile.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/storage/local/LocalFile.java
@@ -83,4 +83,14 @@ public class LocalFile implements IFile {
    public File getDocument() {
        return file;
    }

    @Override
    public boolean equals(Object object) {
        if (this == object)
            return true;
        if (!(object instanceof LocalFile))
            return false;
        LocalFile file = (LocalFile) object;
        return file.getUri().equals(getUri());
    }
}