[Android] Set use_raw_android_executable explicitly for test() template.

https://chromium-review.googlesource.com/c/chromium/src/+/2826493 changes the
default value of use_raw_android_executable when build_with_chromium==false.
This CL compensates accordingly.

Bug: chromium:1149922
Change-Id: Iad544e56a3611e7d7edc1e4e9f20f390fe07c169
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215280
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33748}
diff --git a/webrtc.gni b/webrtc.gni
index 574df1f..249ae62 100644
--- a/webrtc.gni
+++ b/webrtc.gni
@@ -473,6 +473,7 @@
     }
     if (!build_with_chromium && is_android) {
       android_manifest = webrtc_root + "test/android/AndroidManifest.xml"
+      use_raw_android_executable = false
       min_sdk_version = 21
       target_sdk_version = 23
       deps += [