fix Kisok spelling error

Author: theScrabi

src/main/java/org/schabi/newpipe/extractor/kiosk/KioskList.java

@@ -82,7 +82,7 @@ public KioskExtractor getExtractorById(String kioskId, String nextStreamsUrl)
         }
     }
 
-    public Set<String> getAvailableKisoks() {
+    public Set<String> getAvailableKiosks() {
         return kioskList.keySet();
     }
 

src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeServiceTest.java

@@ -48,11 +48,11 @@ public void setUp() throws Exception {
 
     @Test
     public void testGetKioskAvailableKiosks() throws Exception {
-        assertFalse("No kiosk got returned", kioskList.getAvailableKisoks().isEmpty());
+        assertFalse("No kiosk got returned", kioskList.getAvailableKiosks().isEmpty());
     }
 
     @Test
-    public void testGetDefaultKisok() throws Exception {
+    public void testGetDefaultKiosk() throws Exception {
         assertEquals(kioskList.getDefaultKioskExtractor(null).getName(), "Trending");
     }
 }