[framework/uiauto] Revert changes to original uiauto library

We don't want to change the old uiauto library at the moment. We will
update uiauto along with each workload using it.

wa/framework/uiauto/app/build.gradle

@@ -2,8 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 28
-    // buildToolsVersion is no longer used/accepted.
-    // buildToolsVersion '28.0.3'
+    buildToolsVersion '28.0.3'
     defaultConfig {
         minSdkVersion 18
         targetSdkVersion 28

wa/framework/uiauto/build.gradle

@@ -2,8 +2,8 @@
 
 buildscript {
     repositories {
+        jcenter()
         google()
-        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.2.1'
@@ -16,8 +16,8 @@ buildscript {
 
 allprojects {
     repositories {
+        jcenter()
         google()
-        mavenCentral()
     }
 }