enable edit cover btn in share dialog

src/main/res/layout/dialog_share.xml

@@ -66,9 +66,7 @@
         android:layout_marginTop="16dp"
         android:background="@null"
         android:drawablePadding="8dp"
-        android:drawableTint="@android:color/darker_gray"
         android:drawableTop="@drawable/ic_cover_36dp"
-        android:enabled="false"
         android:gravity="center"
         android:text="@string/share_dialog_edit_cover"
         app:layout_constraintBottom_toTopOf="@id/btn_shareDialog_exportPdf"