Error in AM/PM conversion when using an escaped space in custom format

[deekthesqueak]

This is:

- [x] a bug report

What is the expected behavior?

Dates with escaped spaces in their format should properly handle AM/PM conversion.

What is the current behavior?

Dates formats escaped with a backslash \ do not handle AM/PM conversion correctly.

diff --git a/tests/data/Style/NumberFormatDates.php b/tests/data/Style/NumberFormatDates.php
--- a/tests/data/Style/NumberFormatDates.php
+++ b/tests/data/Style/NumberFormatDates.php
@@ -52,4 +52,14 @@ return [
         22269.0625,
         '[DBNum1][$-804]m"月"d"日";@',
     ],
+    [
+        '07:35:00 AM',
+        43270.315972222,
+        'hh:mm:ss\ AM/PM'
+    ],
+    [
+        '02:29:00 PM',
+        43270.603472222,
+        'hh:mm:ss\ AM/PM'
+    ]
 ]

What are the steps to reproduce?

See test cases above.

Which versions of PhpSpreadsheet and PHP are affected?

Current

See https://github.com/PHPOffice/PhpSpreadsheet/pull/558/files for possible solution.