fix: Bug in Session_Transaction_Manager::pop_transaction_id() fixed #1094

Job	Run time
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.1	3m 39s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.1 with HPOS activated	3m 15s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.1 in Debug Mode	3m 43s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.1	3m 33s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.0	3m 24s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.0 with HPOS activated	3m 40s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.0	3m 7s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.0	3m 34s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP7.4	5m 16s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP7.4 with HPOS activated with Codecoverage	16m 22s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP7.4	5m 10s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP7.4	5m 13s
	59m 56s

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