Fix ArrayItem entries in pretty printer maps

The tests were written in such a way that the regression was not
caught.

lib/PhpParser/PrettyPrinterAbstract.php

@@ -1250,7 +1250,7 @@ protected function initializeRemovalMap() {
  $stripEquals = ['left' => '='];
  $this->removalMap = [
  'Expr_ArrayDimFetch->dim' => $stripBoth,
- 'Expr_ArrayItem->key' => $stripDoubleArrow,
+ 'ArrayItem->key' => $stripDoubleArrow,
  'Expr_ArrowFunction->returnType' => $stripColon,
  'Expr_Closure->returnType' => $stripColon,
  'Expr_Exit->expr' => $stripBoth,
@@ -1293,7 +1293,7 @@ protected function initializeInsertionMap() {
  // [$find, $beforeToken, $extraLeft, $extraRight]
  $this->insertionMap = [
  'Expr_ArrayDimFetch->dim' => ['[', false, null, null],
- 'Expr_ArrayItem->key' => [null, false, null, ' => '],
+ 'ArrayItem->key' => [null, false, null, ' => '],
  'Expr_ArrowFunction->returnType' => [')', false, ': ', null],
  'Expr_Closure->returnType' => [')', false, ': ', null],
  'Expr_Ternary->if' => ['?', false, ' ', ' '],

test/code/formatPreservation/insertionOfNullable.test

@@ -16,7 +16,7 @@ $foo
 ];
 
 [
- $value
+ & $value
 ];
 
 function
@@ -107,7 +107,7 @@ $foo
 ];
 
 [
- 'X' => $value
+ 'X' => & $value
 ];
 
 function
@@ -191,4 +191,4 @@ try
 }
 catch (Exception $e)
 {
-}
+}

test/code/formatPreservation/removalViaNull.test

@@ -43,7 +43,7 @@ $foo
 ? $bar :
 $baz;
 [ $a => $b
-, $c => $d];
+, $c => & $d];
 
 yield
 $foo
@@ -149,7 +149,7 @@ $foo
 ?:
 $baz;
 [ $a => $b
-, $d];
+, & $d];
 
 yield
 $bar;
@@ -209,4 +209,4 @@ try
 }
 catch (Exception)
 {
-}
+}