Replace the last usage of sysrootfile instead of sysrootname

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

Jenkinsfile

@@ -255,7 +255,7 @@ def buildSysroot(architecture, type, debosarguments = "") {
             rm ospack*""")
 
       // Generate sysroot metadata
-      writeFile file: "sysroot/${release}/sysroot-${osname}-${release}-${architecture}", text: "version=${release} ${PIPELINE_VERSION}\nurl=${sysroot_url_prefix}/${release}/${sysrootfile}"
+      writeFile file: "sysroot/${release}/sysroot-${osname}-${release}-${architecture}", text: "version=${release} ${PIPELINE_VERSION}\nurl=${sysroot_url_prefix}/${release}/${sysrootname}"
     }
 }