Fix compilation of add-resource tag.

It used the wrong tag-type to find the end of itself.
diff --git a/tools/aapt/ResourceTable.cpp b/tools/aapt/ResourceTable.cpp
index f9d2434..3cf6a71 100644
--- a/tools/aapt/ResourceTable.cpp
+++ b/tools/aapt/ResourceTable.cpp
@@ -984,7 +984,7 @@
 
                 while ((code=block.next()) != ResXMLTree::END_DOCUMENT && code != ResXMLTree::BAD_DOCUMENT) {
                     if (code == ResXMLTree::END_TAG) {
-                        if (strcmp16(block.getElementName(&len), private_symbols16.string()) == 0) {
+                        if (strcmp16(block.getElementName(&len), add_resource16.string()) == 0) {
                             break;
                         }
                     }