Fixed KT-5110 Smart completion: do not generate comma if next argument has default value

Fixed KT-5109 Smart completion: do not insert comma if next argument is vararg

 #KT-5110 Fixed
 #KT-5109 Fixed

idea/testData/completion/handlers/smart/Comma10.kt

@@ -0,0 +1,7 @@
+fun foo(p1: String, p2: String = ""){}
+
+fun bar(p: String){
+    foo(<caret>)
+}
+
+// ELEMENT: p

idea/testData/completion/handlers/smart/Comma10.kt.after

@@ -0,0 +1,7 @@
+fun foo(p1: String, p2: String = ""){}
+
+fun bar(p: String){
+    foo(p<caret>)
+}
+
+// ELEMENT: p

idea/testData/completion/handlers/smart/Comma11.kt

@@ -0,0 +1,7 @@
+fun foo(p1: String, vararg p2: String){}
+
+fun bar(p: String){
+    foo(<caret>)
+}
+
+// ELEMENT: p

idea/testData/completion/handlers/smart/Comma11.kt.after

@@ -0,0 +1,7 @@
+fun foo(p1: String, vararg p2: String){}
+
+fun bar(p: String){
+    foo(p<caret>)
+}
+
+// ELEMENT: p