Fixed 'Implement members implement functions with no curly braces - not convenient'

#KT-1317 fixed

idea/testData/codeInsight/overrideImplement/generateMulti.kt.after

@@ -14,5 +14,7 @@ class SomeOther<S> : Some<S> {
     override fun someGenericFoo(): S {
         throw UnsupportedOperationException()
     }
-    override fun someOtherFoo(): Int = 0
+    override fun someOtherFoo(): Int {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/genericMethod.kt.after

@@ -4,5 +4,7 @@ trait G<T> {
 
 class GC() : G<Int> {
 
-    override fun foo(t: Int): Int = 0
+    override fun foo(t: Int): Int {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/javaInterfaceMethod/foo/Impl.kt.after

@@ -2,5 +2,7 @@ import foo.Intf
 
 class Impl(): Intf {
 
-    override fun getFooBar(): String? = null
+    override fun getFooBar(): String? {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/traitNullableFunction.kt.after

@@ -4,5 +4,7 @@ trait Some {
 
 class SomeOther : Some {
 
-    override fun foo(some: Int?): Int = 0
+    override fun foo(some: Int?): Int {
+        throw UnsupportedOperationException()
+    }
 }