replace kotlin-result-calladapter with networkresult-calladapter (#2569)

* replace kotlin-result-calladapter with networkresult-calladapter

* fix tests

app/src/main/java/com/keylesspalace/tusky/util/CallExtensions.kt

@@ -1,23 +0,0 @@
-package com.keylesspalace.tusky.util
-
-import retrofit2.Call
-import retrofit2.HttpException
-
-/**
- * Synchronously executes the call and returns the response encapsulated in a kotlin.Result.
- * Since Result is an inline class it is not possible to do this with a Retrofit adapter unfortunately.
- * More efficient then calling a suspending method with runBlocking
- */
-fun <T> Call<T>.result(): Result<T> {
-    return try {
-        val response = execute()
-        val responseBody = response.body()
-        if (response.isSuccessful && responseBody != null) {
-            Result.success(responseBody)
-        } else {
-            Result.failure(HttpException(response))
-        }
-    } catch (e: Exception) {
-        Result.failure(e)
-    }
-}