Disable loading boot image extensions for tests.

Run tests with --relocate are hitting a DCHECK().

Test: testrunner.py --host --optimizing --relocate
Bug: 119800099
Change-Id: I933f3f917ac04271a917c4336a2d90334d89a092
diff --git a/test/run-test b/test/run-test
index 72e7562..eeeefbb 100755
--- a/test/run-test
+++ b/test/run-test
@@ -672,12 +672,12 @@
 elif [ "$runtime" = "art" ]; then
     if [ "$target_mode" = "no" ]; then
         guess_host_arch_name
-        run_args+=(--boot "${ANDROID_HOST_OUT}/framework/core${image_suffix}.art:*")
+        run_args+=(--boot "${ANDROID_HOST_OUT}/framework/core${image_suffix}.art")
         run_args+=(--runtime-option "-Djava.library.path=${host_lib_root}/lib${suffix64}:${host_lib_root}/nativetest${suffix64}")
     else
         guess_target_arch_name
         run_args+=(--runtime-option "-Djava.library.path=/data/nativetest${suffix64}/art/${target_arch_name}")
-        run_args+=(--boot "/data/art-test/core${image_suffix}.art:/data/art-test/*")
+        run_args+=(--boot "/data/art-test/core${image_suffix}.art")
     fi
     if [ "$relocate" = "yes" ]; then
       run_args+=(--relocate)