[FIX] gamification: restore broken images in non-demo data

For some strange reasons, the e-learning ranks are created in data but
the demo data override their motivational message fields.
Unfortunately, the demo data were ok but the normal data had broken
images in them.

closes odoo/odoo#34282

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/gamification/data/gamification_karma_rank_data.xml

@@ -15,7 +15,7 @@
         <field name="description_motivational" type="html">
             <div class="media align-items-center">
                 <div class="media-body">Reach the next rank to show the rest of the world you exist!</div>
-                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="gamification/static/img/rank_student_badge.svg"/>
+                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="/gamification/static/img/rank_student_badge.svg"/>
             </div>
         </field>
         <field name="karma_min">1</field>
@@ -28,7 +28,7 @@
         <field name="description_motivational" type="html">
             <div class="media align-items-center">
                 <div class="media-body">Reach the next rank to improve your status.</div>
-                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="gamification/static/img/rank_bachelor_badge.svg"/>
+                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="/gamification/static/img/rank_bachelor_badge.svg"/>
             </div>
         </field>
         <field name="karma_min">100</field>
@@ -41,7 +41,7 @@
         <field name="description_motivational" type="html">
             <div class="media align-items-center">
                 <div class="media-body">Reach the next rank and become a Master!</div>
-                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="gamification/static/img/rank_master_badge.svg"/>
+                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="/gamification/static/img/rank_master_badge.svg"/>
             </div>
         </field>
         <field name="karma_min">500</field>
@@ -54,7 +54,7 @@
         <field name="description_motivational" type="html">
             <div class="media align-items-center">
                 <div class="media-body">Reach the next rank and become a powerful user!</div>
-                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="gamification/static/img/rank_doctor_badge.svg"/>
+                <img class="ml-3 img img-fluid" style="max-height: 72px;" src="/gamification/static/img/rank_doctor_badge.svg"/>
             </div>
         </field>
         <field name="karma_min">2000</field>