Fix non exhaustive error

Author: sadevelopment

firebase-common/src/iosMain/kotlin/dev/gitlive/firebase/_decoders.kt

@@ -10,13 +10,13 @@ import kotlinx.serialization.SerialDescriptor
 import kotlinx.serialization.StructureKind
 
 actual fun FirebaseDecoder.structureDecoder(desc: SerialDescriptor, vararg typeParams: KSerializer<*>): CompositeDecoder = when(desc.kind as StructureKind) {
-        StructureKind.CLASS, StructureKind.OBJECT -> (value as Map<*, *>).let { map ->
-            FirebaseClassDecoder(map.size, { map.containsKey(it) }) { desc, index -> map[desc.getElementName(index)] }
-        }
-        StructureKind.LIST -> (value as List<*>).let {
-            FirebaseCompositeDecoder(it.size) { _, index -> it[index] }
-        }
-        StructureKind.MAP -> (value as Map<*, *>).entries.toList().let {
-            FirebaseCompositeDecoder(it.size) { _, index -> it[index/2].run { if(index % 2 == 0) key else value }  }
-        }
-    }
+    StructureKind.CLASS, StructureKind.OBJECT -> (value as Map<*, *>).let { map ->
+        FirebaseClassDecoder(map.size, { map.containsKey(it) }) { desc, index -> map[desc.getElementName(index)] }
+    }
+    StructureKind.LIST -> (value as List<*>).let {
+        FirebaseCompositeDecoder(it.size) { _, index -> it[index] }
+    }
+    StructureKind.MAP -> (value as Map<*, *>).entries.toList().let {
+        FirebaseCompositeDecoder(it.size) { _, index -> it[index/2].run { if(index % 2 == 0) key else value }  }
+    }
+}