Fix module info for XE 1.7 compliance

Specify request method property in module.xml

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#	modified:   LICENSE
#	modified:   conf/info.xml
#	modified:   conf/module.xml
#	modified:   elfinderxe.admin.controller.php
#	modified:   elfinderxe.admin.view.php
#	modified:   elfinderxe.class.php
#	modified:   elfinderxe.controller.php
#	modified:   elfinderxe.view.php
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