base: fix smartmon attribute name

roles/float-base/files/node-exporter-scripts/smartmon.py

@@ -20,7 +20,7 @@ smart_attributes_whitelist = {
     'current_pending_sector',
     'end_to_end_error',
     'erase_fail_count_total',
-    'g_sense_error_rate',
+    'g-sense_error_rate',
     'hardware_ecc_recovered',
     'host_reads_mib',
     'host_reads_32mib',