fix: Seismic filter now use case-insensitive check for networks

Sources/Earthquake Network/Models/EQNSeismic.swift

@@ -109,12 +109,13 @@ import Foundation
     
     @objc func filterSeismicList(_ list: [EQNSisma]) -> [EQNSisma] {
         // enti abilitati
-        let networks: [String]
+        var networks: [String]
         if let savedNetworks = UserDefaults.standard.object(forKey: IMPOSTAZIONE_ENTI_RETI_SISMICHEI) as? [String] {
             networks = savedNetworks
         } else {
             networks = EQNData.seismicNetworkAcronyms()
         }
+        networks = networks.map { $0.lowercased() }
         
         // filtri
         let filterDistance = Double(distanzaMassima)
@@ -130,7 +131,7 @@ import Foundation
         for seismic in list {
             var keep = true
             
-            if !networks.contains(seismic.provider) {
+            if !networks.contains(seismic.provider.lowercased()) {
                 keep = false
             }