fix RecentlyNonNull/Nullable warnings

app/src/main/java/com/keylesspalace/tusky/LoginActivity.kt

@@ -78,7 +78,7 @@ class LoginActivity : AppCompatActivity(), Injectable {
         setContentView(R.layout.activity_login)
 
         if (savedInstanceState != null) {
-            domain = savedInstanceState.getString(DOMAIN)
+            domain = savedInstanceState.getString(DOMAIN)!!
             clientId = savedInstanceState.getString(CLIENT_ID)
             clientSecret = savedInstanceState.getString(CLIENT_SECRET)
         }
@@ -225,7 +225,7 @@ class LoginActivity : AppCompatActivity(), Injectable {
             val code = uri.getQueryParameter("code")
             val error = uri.getQueryParameter("error")
 
-            domain = preferences.getString(DOMAIN, "")
+            domain = preferences.getString(DOMAIN, "")!!
 
             if (code != null && domain.isNotEmpty()) {
                 /* During the redirect roundtrip this Activity usually dies, which wipes out the

app/src/main/java/com/keylesspalace/tusky/receiver/SendStatusBroadcastReceiver.kt

@@ -139,7 +139,7 @@ class SendStatusBroadcastReceiver : BroadcastReceiver() {
     private fun getReplyMessage(intent: Intent): CharSequence {
         val remoteInput = RemoteInput.getResultsFromIntent(intent)
 
-        return remoteInput.getCharSequence(NotificationHelper.KEY_REPLY)
+        return remoteInput.getCharSequence(NotificationHelper.KEY_REPLY, "")
     }
 
 }

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

@@ -4,8 +4,8 @@ import android.text.TextPaint
 import android.text.style.ClickableSpan
 
 abstract class ClickableSpanNoUnderline : ClickableSpan() {
-    override fun updateDrawState(ds: TextPaint?) {
+    override fun updateDrawState(ds: TextPaint) {
         super.updateDrawState(ds)
-        ds?.isUnderlineText = false
+        ds.isUnderlineText = false
     }
 }