Remove appbundle

It's not used by the platform.  Bundletool will be provided by
maven prebuilts in prebuilts/tools/common/m2 instead.

Bug: 117295826
Test: m checkbuild
Change-Id: I75c5648af8b0a2ae8c4f7f34705c61a7c2d12023
diff --git a/default.xml b/default.xml
index 41f9a9d..8b9267d 100644
--- a/default.xml
+++ b/default.xml
@@ -699,7 +699,6 @@
   <project path="toolchain/benchmark" name="toolchain/benchmark" />
   <project path="toolchain/pgo-profiles" name="toolchain/pgo-profiles" groups="pdk" />
   <project path="tools/acloud" name="platform/tools/acloud" groups="tools,vts,pdk,tradefed" />
-  <project path="tools/appbundle" name="platform/tools/appbundle" />
   <project path="tools/adt/idea" name="platform/tools/adt/idea" groups="notdefault,tools" />
   <project path="tools/apksig" name="platform/tools/apksig" groups="pdk,tradefed" />
   <project path="tools/apkzlib" name="platform/tools/apkzlib" groups="pdk,tradefed" />