add icon for tabs preference (#1892)

app/src/main/java/com/keylesspalace/tusky/fragment/preference/AccountPreferencesFragment.kt

@@ -72,6 +72,7 @@ class AccountPreferencesFragment : PreferenceFragmentCompat(), Injectable {
 
             preference {
                 setTitle(R.string.title_tab_preferences)
+                icon = getTintedIcon(R.drawable.ic_tabs)
                 setOnPreferenceClickListener {
                     val intent = Intent(context, TabPreferenceActivity::class.java)
                     activity?.startActivity(intent)

app/src/main/res/drawable/ic_tabs.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:height="24dp"
+    android:width="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path android:fillColor="#000" android:pathData="M22,14A2,2 0 0,1 20,16H4A2,2 0 0,1 2,14V10A2,2 0 0,1 4,8H20A2,2 0 0,1 22,10V14M4,14H8V10H4V14M10,14H14V10H10V14M16,14H20V10H16V14Z" />
+</vector>