Update Sign-in Burst from Multiple Locations.yaml

DetectionTemplate validation is failing with - YamlDotNet.Core.SemanticErrorException : (Line: 20, Col: 1, Idx: 451) - (Line: 20, Col: 3, Idx: 453): While scanning a literal block scalar, found extra spaces in first line.

Removing empty line from after query: | to see if it is that.

Detections/SigninLogs/Sign-in Burst from Multiple Locations.yaml

@@ -16,7 +16,6 @@ tactics:
 relevantTechniques:
   - T1110
 query: |
-  
   let RunTime = 1h;
   SigninLogs
   | where TimeGenerated > ago(RunTime)