Fix redundant escape \\ in regex in Utils

Author: Stypox

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Utils.java

@@ -20,8 +20,8 @@ public final class Utils {
     public static final String HTTPS = "https://";
     public static final String UTF_8 = "UTF-8";
     public static final String EMPTY_STRING = "";
-    private static final Pattern M_PATTERN = Pattern.compile("(https?)?:\\/\\/m\\.");
-    private static final Pattern WWW_PATTERN = Pattern.compile("(https?)?:\\/\\/www\\.");
+    private static final Pattern M_PATTERN = Pattern.compile("(https?)?://m\\.");
+    private static final Pattern WWW_PATTERN = Pattern.compile("(https?)?://www\\.");
 
     private Utils() {
         // no instance