Change wording on keyserver upload and disable by default for new keys

OpenKeychain/src/main/res/layout/create_key_final_fragment.xml

@@ -72,7 +72,6 @@
                 android:layout_marginTop="8dp"
                 android:layout_marginBottom="8dp"
                 android:textAppearance="?android:attr/textAppearanceMedium"
-                android:checked="true"
                 android:text="@string/create_key_upload"
                 android:id="@+id/create_key_upload" />