Refactor according to gates.

- Remove call to `Object.equals()` in `CSVModuleBuiltins`, as `NOT_SET` is a constant marker we set
  to indicate a not set value, comparing on object identity equality is applicable.
- Remove double empty line in `CSVDialect`.

Author: phoeinx

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/csv/CSVDialect.java

@@ -68,7 +68,6 @@ public CSVDialect(Object cls, Shape instanceShape) {
         super(cls, instanceShape);
     }
 
-
     public CSVDialect(Object cls, Shape instanceShape, String delimiter, boolean doubleQuote, String escapeChar,
                     String lineTerminator, String quoteChar, QuoteStyle quoting, boolean skipInitialSpace,
                     boolean strict) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/csv/CSVModuleBuiltins.java

@@ -543,8 +543,9 @@ private String getCharOrNone(String attribute, Object valueObj, String defaultVa
             if (valueObj == PNone.NO_VALUE) {
                 return defaultValue;
             }
-            if (valueObj == PNone.NONE || valueObj.equals(NOT_SET)) {
+            if (valueObj == PNone.NONE || valueObj == NOT_SET) {
                 return NOT_SET;
+
             }
 
             return getChar(attribute, valueObj, defaultValue, getType, castToJavaStringNode);