FIR checker: Enable ReplaceWithDotCallFix for UNNECESSARY_SAFE_CALL.

idea/testData/quickfix/expressions/unnecessarySafeCall1.kt

@@ -1,6 +1,4 @@
 // "Replace with dot call" "true"
 fun foo(a: Any) {
     a<caret>?.equals(0)
-}
-
-/* IGNORE_FIR */
+}

idea/testData/quickfix/expressions/unnecessarySafeCall1.kt.after

@@ -1,6 +1,4 @@
 // "Replace with dot call" "true"
 fun foo(a: Any) {
     a<caret>.equals(0)
-}
-
-/* IGNORE_FIR */
+}

idea/testData/quickfix/expressions/unnecessarySafeCall2.kt

@@ -0,0 +1,4 @@
+// "Replace with dot call" "true"
+fun Any.foo() {
+    this<caret>?.equals(0)
+}

idea/testData/quickfix/expressions/unnecessarySafeCall2.kt.after

@@ -1,7 +1,4 @@
 // "Replace with dot call" "true"
-fun foo(a: Any) {
-    when (a) {
-        .equals(0) => true
-        else => false
-    }
+fun Any.foo() {
+    this.equals(0)
 }