Update PSMDB tarball loc change for 7.0 (#735)

pmm-tests/psmdb_setup.sh

@@ -37,7 +37,7 @@ export SERVICE_RANDOM_NUMBER=$(echo $((1 + $RANDOM % 9999)))
 
 ### Detect latest tarball link for specified mongodb_version: 7.0 | 6.0 | 5.0 | 4.4 | 4.2 at the moment
 psmdb_latest=$(wget -q --post-data "version=percona-server-mongodb-${mongodb_version}" https://www.percona.com/products-api.php -O - | grep  -oP "(?<=value\=\")[^\"]*" | sort -V | tail -1)
-if [[ "$mongodb_version" == "7.0" || "$mongodb_version" == "4.4" ]]; then
+if [[ "$mongodb_version" == "4.4" ]]; then
    psmdb_tarball=$(wget -q --post-data "version_files=${psmdb_latest}&software_files=binary" https://www.percona.com/products-api.php -O - | jq -r '.[] | select(.link | contains("sha") | not) | .link' | grep glibc2\.17-minimal)
 else
    psmdb_tarball=$(wget -q --post-data "version_files=${psmdb_latest}&software_files=binary" https://www.percona.com/products-api.php -O - | jq -r '.[] | select(.link | contains("sha") | not) | .link' | grep focal-minimal)