Fix variable name typo (take 2)

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/970

roles/matrix-jitsi/templates/web/interface_config.js.j2

@@ -177,7 +177,7 @@ var interfaceConfig = {
     */
     SHOW_CHROME_EXTENSION_BANNER: false,
 
-    SHOW_DEEP_LINKING_IMAGE: {{ matrix_jisti_web_interface_config_show_deep_linking_image|to_json }},
+    SHOW_DEEP_LINKING_IMAGE: {{ matrix_jitsi_web_interface_config_show_deep_linking_image|to_json }},
     SHOW_JITSI_WATERMARK: {{ matrix_jitsi_web_interface_config_show_jitsi_watermark|to_json }},
     SHOW_POWERED_BY: {{ matrix_jitsi_web_interface_config_show_powered_by|to_json }},
     SHOW_PROMOTIONAL_CLOSE_PAGE: false,