Fix conversion of assignment as expression in J2K

Blockless if's and so with assignment as expression inside
should turn into blockful
 #KT-16816 fixed

j2k/testData/fileOrElement/ifStatement/assignmentAsExpressionInIf.java

@@ -0,0 +1,9 @@
+public class SomeClass {
+    void doSomeIf(int i) {
+        int a,b,c
+        if (i < 0)
+            a = b = i;
+        else
+            b = c = i;
+    }
+}