fix(measurements): Ignore case when parsing probe_asn field

[nfebe]

Resolves : #318

[aagbsn]

some paths have changed which makes merging this cleanly kind of difficult; here's where your changes would go now:

diff --git a/ooniapi/services/oonimeasurements/src/oonimeasurements/routers/v1/measurements.py b/ooniapi/services/oonimeasurements/src/oonimeasurements/routers/v1/measurements.py
index 06c9381d..fb171a23 100644
--- a/ooniapi/services/oonimeasurements/src/oonimeasurements/routers/v1/measurements.py
+++ b/ooniapi/services/oonimeasurements/src/oonimeasurements/routers/v1/measurements.py
@@ -765,7 +765,7 @@ async def list_measurements(
             probe_asn_list = probe_asn.split(",")
             probe_asn_integer_list = []
             for probe_asn_value in probe_asn_list:
-                if probe_asn_value.startswith("AS"):
+                if probe_asn_value.lower().startswith("as"):
                     probe_asn_value = probe_asn_value[2:]
                 probe_asn_integer_list.append(int(probe_asn_value))
         query_params["probe_asn"] = probe_asn_integer_list

Thank you for your contribution!