Reverts a previous unnecessary change that's accidentally committed for StringUtils

Author: oguzkocer

WordPressUtils/src/main/java/org/wordpress/android/util/StringUtils.java

@@ -186,7 +186,7 @@ public static String removeTrailingSlash(final String str) {
             return str;
         }
 
-        return str.substring(0, str.length() - 1);
+        return str.substring(0, str.length() -1);
     }
 
     /*
@@ -301,10 +301,4 @@ public static long stringToLong(String s, long defaultValue) {
             return defaultValue;
         }
     }
-
-    public static void convertArrayToLowercase(String[] array) {
-        for (int i = 0; i < array.length; i++) {
-            array[i] = array[i].toLowerCase();
-        }
-    }
 }