Update menu icons in Browse Sources view (closes #5397)

app/src/main/res/drawable/ic_travel_explore_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="@android:color/black"
+      android:pathData="M19.3,16.9c0.4,-0.7 0.7,-1.5 0.7,-2.4c0,-2.5 -2,-4.5 -4.5,-4.5S11,12 11,14.5s2,4.5 4.5,4.5c0.9,0 1.7,-0.3 2.4,-0.7l3.2,3.2l1.4,-1.4L19.3,16.9zM15.5,17c-1.4,0 -2.5,-1.1 -2.5,-2.5s1.1,-2.5 2.5,-2.5s2.5,1.1 2.5,2.5S16.9,17 15.5,17zM12,20v2C6.48,22 2,17.52 2,12C2,6.48 6.48,2 12,2c4.84,0 8.87,3.44 9.8,8h-2.07c-0.64,-2.46 -2.4,-4.47 -4.73,-5.41V5c0,1.1 -0.9,2 -2,2h-2v2c0,0.55 -0.45,1 -1,1H8v2h2v3H9l-4.79,-4.79C4.08,10.79 4,11.38 4,12C4,16.41 7.59,20 12,20z"/>
+</vector>

app/src/main/res/menu/browse_sources.xml

@@ -3,7 +3,7 @@
 
     <item
         android:id="@+id/action_search"
-        android:icon="@drawable/ic_search_24dp"
+        android:icon="@drawable/ic_travel_explore_24dp"
         android:title="@string/action_search"
         app:actionViewClass="androidx.appcompat.widget.SearchView"
         app:iconTint="?attr/colorOnToolbar"
@@ -11,7 +11,7 @@
 
     <item
         android:id="@+id/action_settings"
-        android:icon="@drawable/ic_translate_24dp"
+        android:icon="@drawable/ic_filter_list_24dp"
         android:title="@string/action_filter"
         app:iconTint="?attr/colorOnToolbar"
         app:showAsAction="ifRoom" />