Convert Receiver to Parameter: Place new parameter at the start

This affects editor template only since Change Signature already
puts converted receiver at the parameter list start by default

 #KT-15543 Fixed

idea/testData/intentions/convertReceiverToParameter/autoSuggestedName.kt

@@ -0,0 +1,3 @@
+fun <caret>String.foo(s: String): String {
+    return this + s
+}

idea/testData/intentions/convertReceiverToParameter/autoSuggestedName.kt.after

@@ -0,0 +1,3 @@
+fun <caret>foo(s1: String, s: String): String {
+    return s1 + s
+}