Lint: fix IconDipSize and IconDuplicatesConfig error (by removing unused resource)

vector/lint.xml

@@ -7,6 +7,8 @@
     <issue id="TypographyEllipsis" severity="error" />
     <issue id="ImpliedQuantity" severity="warning" />
     <issue id="IconXmlAndPng" severity="error" />
+    <issue id="IconDipSize" severity="error" />
+    <issue id="IconDuplicatesConfig" severity="error" />
 
     <!-- UX -->
     <issue id="ButtonOrder" severity="error" />

vector/src/main/res/menu/vector_searches.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    tools:context="org.matrix.vector.activity.RoomActivity">
-
-    <item
-        android:id="@+id/ic_action_speak_to_search"
-        android:icon="@drawable/vector_micro_green"
-        android:title="@string/speak"
-        app:showAsAction="always" />
-
-    <item
-        android:id="@+id/ic_action_clear_search"
-        android:icon="@drawable/vector_clear_edittext_green"
-        android:title="@string/clear"
-        app:showAsAction="always" />
-</menu>