PIR: Small fixes related to initial scan (#6663)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/72649045549333/task/1211148863343070?focus=true

### Description
See attached task description

### Steps to test this PR
Run PIR scan and dashboard should now show correct scanned number

Author: karlenDimla

pir/pir-impl/src/main/java/com/duckduckgo/pir/impl/dashboard/messaging/handlers/PirWebInitialScanStatusMessageHandler.kt

@@ -64,7 +64,7 @@ class PirWebInitialScanStatusMessageHandler @Inject constructor(
                 response = PirWebMessageResponse.InitialScanResponse(
                     resultsFound = getResultsFound(),
                     scanProgress = PirWebMessageResponse.InitialScanResponse.ScanProgress(
-                        currentScan = stateProvider.getFullyCompletedBrokersTotal(),
+                        currentScans = stateProvider.getFullyCompletedBrokersTotal(),
                         totalScans = stateProvider.getActiveBrokersAndMirrorSitesTotal(),
                         scannedBrokers = getScannedBrokers(),
                     ),

pir/pir-impl/src/main/java/com/duckduckgo/pir/impl/dashboard/messaging/model/PirWebMessageResponse.kt

@@ -102,7 +102,7 @@ sealed interface PirWebMessageResponse {
         }
 
         data class ScanProgress(
-            val currentScan: Int,
+            val currentScans: Int,
             val totalScans: Int,
             val scannedBrokers: List<ScannedBroker>,
         ) {