gradle: set the coreLibraryDesugaringEnabled with =

The old way is marked as deprecated.

> Properties should be assigned using the 'propName = value' syntax. Setting a
> property via the Gradle-generated 'propName value' or 'propName(value)'
> syntax in Groovy DSL has been deprecated.

application/app/build.gradle

@@ -5,7 +5,7 @@ plugins {
 
 android {
     compileOptions {
-        coreLibraryDesugaringEnabled true
+        coreLibraryDesugaringEnabled = true
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }

application/remote-access-server/build.gradle

@@ -47,7 +47,7 @@ android {
     }
 
     compileOptions {
-        coreLibraryDesugaringEnabled true
+        coreLibraryDesugaringEnabled = true
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }