fix: fix typo in plugin.xml

Author: btry

plugin.xml

@@ -64,22 +64,22 @@ Features
       <version>
          <num>2.13.0-alpha.4</num>
          <compatibility>~10.0</compatibility>
-         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/v2.13.0-alpha.4/glpi-formcreator-2.13.0-alpha.4.tar.bz2</download_url>
+         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/2.13.0-alpha.4/glpi-formcreator-2.13.0-alpha.4.tar.bz2</download_url>
       </version>
       <version>
          <num>2.13.0-alpha.3</num>
          <compatibility>~10.0</compatibility>
-         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/v2.13.0-alpha.3/glpi-formcreator-2.13.0-alpha.3.tar.bz2</download_url>
+         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/2.13.0-alpha.3/glpi-formcreator-2.13.0-alpha.3.tar.bz2</download_url>
       </version>
       <version>
          <num>2.13.0-alpha.2</num>
          <compatibility>~10.0</compatibility>
-         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/v2.13.0-alpha.2/glpi-formcreator-2.13.0-alpha.2.tar.bz2</download_url>
+         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/2.13.0-alpha.2/glpi-formcreator-2.13.0-alpha.2.tar.bz2</download_url>
       </version>
       <version>
          <num>2.13.0-alpha.1</num>
          <compatibility>~10.0</compatibility>
-         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/v2.13.0-alpha.1/glpi-formcreator-2.13.0-alpha.1.tar.bz2</download_url>
+         <download_url>https://github.com/pluginsGLPI/formcreator/releases/download/2.13.0-alpha.1/glpi-formcreator-2.13.0-alpha.1.tar.bz2</download_url>
       </version>
       <version>
          <num>2.12.2</num>