Fix Launcher3 gradle file for launcher protos dep

The launcher_protos.jar library was not being used which prevented the
quickstep launcher variant from building. This fixes the issue.

Test: Build quickstep APK w/ other fixes in topic included
Change-Id: I4d91616aa8f52026ceec235b2adec8c13f7c6dc8
diff --git a/build.gradle b/build.gradle
index 33409c5..af54c5b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -121,8 +121,8 @@
     implementation "androidx.dynamicanimation:dynamicanimation:${ANDROID_X_VERSION}"
     implementation "androidx.recyclerview:recyclerview:${ANDROID_X_VERSION}"
     implementation "androidx.preference:preference:${ANDROID_X_VERSION}"
-    implementation PROTOBUF_DEPENDENCY
     implementation project(':IconLoader')
+    implementation fileTree(dir: "libs", include: 'launcher_protos.jar')
 
     // This is already included in sysui_shared
     aospImplementation fileTree(dir: "libs", include: 'plugin_core.jar')