Code style: disable trailing comma by default

#KT-34744

idea/formatter/src/org/jetbrains/kotlin/idea/core/formatter/KotlinCodeStyleSettings.java

@@ -53,7 +53,7 @@ public class KotlinCodeStyleSettings extends CustomCodeStyleSettings {
     public int WRAP_EXPRESSION_BODY_FUNCTIONS = 0;
     public int WRAP_ELVIS_EXPRESSIONS = 1;
     public boolean IF_RPAREN_ON_NEW_LINE = false;
-    public boolean ALLOW_TRAILING_COMMA = true;
+    public boolean ALLOW_TRAILING_COMMA = false;
 
     @ReflectionUtil.SkipInEquals
     public String CODE_STYLE_DEFAULTS = null;

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinStyleGuideCodeStyle.kt

@@ -58,7 +58,7 @@ class KotlinStyleGuideCodeStyle : KotlinPredefinedCodeStyle("Kotlin style guide"
                 CONTINUATION_INDENT_IN_ELVIS = false
                 WRAP_EXPRESSION_BODY_FUNCTIONS = CodeStyleSettings.WRAP_AS_NEEDED
                 IF_RPAREN_ON_NEW_LINE = true
-                ALLOW_TRAILING_COMMA = true
+                ALLOW_TRAILING_COMMA = false
             }
         }