priorities must be signed nums

app/src/main/res/xml/preference_editor.xml

@@ -268,6 +268,7 @@
                     android:defaultValue="@string/connection_priority_chat_default"
                     android:dependency="@string/connection_adjust_priority_key"
                     android:title="@string/chat"
+                    android:inputType="numberSigned"
                     android:singleLine="true"
                     />
                 <com.xabber.android.ui.widget.PriorityPreference
@@ -275,6 +276,7 @@
                     android:defaultValue="@string/connection_priority_available_default"
                     android:dependency="@string/connection_adjust_priority_key"
                     android:title="@string/available"
+                    android:inputType="numberSigned"
                     android:singleLine="true"
                     />
                 <com.xabber.android.ui.widget.PriorityPreference
@@ -282,6 +284,7 @@
                     android:defaultValue="@string/connection_priority_away_default"
                     android:dependency="@string/connection_adjust_priority_key"
                     android:title="@string/away"
+                    android:inputType="numberSigned"
                     android:singleLine="true"
                     />
                 <com.xabber.android.ui.widget.PriorityPreference
@@ -289,6 +292,7 @@
                     android:defaultValue="@string/connection_priority_xa_default"
                     android:dependency="@string/connection_adjust_priority_key"
                     android:title="@string/xa"
+                    android:inputType="numberSigned"
                     android:singleLine="true"
                     />
                 <com.xabber.android.ui.widget.PriorityPreference
@@ -296,6 +300,7 @@
                     android:defaultValue="@string/connection_priority_dnd_default"
                     android:dependency="@string/connection_adjust_priority_key"
                     android:title="@string/dnd"
+                    android:inputType="numberSigned"
                     android:singleLine="true"
                     />
             </PreferenceCategory>