Fixed typos in tests

src/test/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudStreamExtractorDefaultTest.java

@@ -105,6 +105,6 @@ public class SoundcloudStreamExtractorDefaultTest {
 
     @Test
     public void testGetSubtitles() throws IOException, ExtractionException, JsonParserException {
-        assertTrue(extractor.getSubtitles() != null);
+        assertTrue(extractor.getSubtitles() == null);
     }
 }

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

@@ -154,6 +154,6 @@ public class YoutubeStreamExtractorDefaultTest {
     @Test
     public void testGetSubtitlesList() throws IOException, ExtractionException, JsonParserException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
-        assertTrue(extractor.getSubtitles() != null);
+        assertTrue(extractor.getSubtitles() == null);
     }
 }

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

@@ -106,7 +106,7 @@ public class YoutubeStreamExtractorRestrictedTest {
     }
 
     @Test
-    public void testGetSubtitlesList() throws IOException, ExtractionException, JsonParserException {
-        assertTrue(extractor.getSubtitles() != null);
+    public void testGetSubtitles() throws IOException, ExtractionException, JsonParserException {
+        assertTrue(extractor.getSubtitles() == null);
     }
 }