one remove/delete icon is enough and the red minus better matches the add icon

src/qt/bitcoin.qrc

@@ -25,7 +25,6 @@
         <file alias="bitcoin_testnet">res/icons/bitcoin_testnet.png</file>
         <file alias="toolbar_testnet">res/icons/toolbar_testnet.png</file>
         <file alias="edit">res/icons/edit.png</file>
-        <file alias="editdelete">res/icons/editdelete.png</file>
         <file alias="history">res/icons/history.png</file>
         <file alias="overview">res/icons/overview.png</file>
         <file alias="export">res/icons/export.png</file>

src/qt/forms/addressbookpage.ui

@@ -89,7 +89,7 @@
        </property>
        <property name="icon">
         <iconset resource="../bitcoin.qrc">
-         <normaloff>:/icons/editdelete</normaloff>:/icons/editdelete</iconset>
+         <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
        </property>
       </widget>
      </item>