Java to Kotlin converter: declaring locals as var's in most of cases when needed, dropped forceLocalVariableImmutability setting

j2k/tests/testData/ast/assignmentExpression/nullability-settings.kt

@@ -5,7 +5,7 @@ import java.util.BitSet
 class Foo() {
     fun foo(o: BitSet?) {
         val o2: BitSet? = o
-        val foo: Int = 0
+        var foo: Int = 0
         foo = o2!!.size()
     }
 }

j2k/tests/testData/ast/assignmentExpression/nullability.kt

@@ -3,7 +3,7 @@ import java.util.BitSet
 class Foo() {
     fun foo(o: BitSet) {
         val o2 = o
-        val foo = 0
+        var foo = 0
         foo = o2.size()
     }
 }