Add ability to scroll to top by tab click at the Account activity (#1146)

* Issue: tuskyapp#1078
Add ability to scroll to top by tab click at the Account activity

* Fix issue with scroll tabs other than current

* Update scroll on click behavior

* Update code formatting

* Remove unused code

* Move tab click listener from Fragments to Activities

app/src/main/java/com/keylesspalace/tusky/interfaces/ReselectableFragment.kt

@@ -0,0 +1,11 @@
+package com.keylesspalace.tusky.interfaces
+
+/**
+ * Created by pandasoft (joelpyska1@gmail.com) on 04/04/2019.
+ */
+interface ReselectableFragment {
+    /**
+     * Call this method when tab reselected
+     */
+    fun onReselect()
+}