erp5_minipaint: set missing http cache settings on png and html

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/miniPaint/img/colorwheel.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>colorwheel.png</string> </value>

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/miniPaint/img/favicon.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>favicon.png</string> </value>

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/miniPaint/img/logo.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>logo.png</string> </value>

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/miniPaint/img/right.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>right.png</string> </value>

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/miniPaint/img/sprites.png.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>sprites.png</string> </value>

bt5/erp5_minipaint/SkinTemplateItem/portal_skins/erp5_minipaint/minipaint.gadget.html.xml

@@ -6,6 +6,10 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>_Cacheable__manager_id</string> </key>
+            <value> <string>http_cache</string> </value>
+        </item>
         <item>
             <key> <string>__name__</string> </key>
             <value> <string>minipaint.gadget.html</string> </value>