#1096: fixed `findExistingForSocialLogin` finder #545

Job	Run time
Coding Standard & Static Analysis	22s
testsuite (7.4, sqlite)	52s
testsuite (7.4, mysql)	1m 12s
testsuite (7.4, pgsql)	1m 4s
testsuite (8.0, sqlite)	50s
testsuite (8.0, mysql)	40s
testsuite (8.0, pgsql)	34s
testsuite (8.1, sqlite)	42s
testsuite (8.1, mysql)	35s
testsuite (8.1, pgsql)	38s
testsuite (8.2, sqlite)	20s
testsuite (8.2, mysql)	32s
testsuite (8.2, pgsql)	39s
testsuite (8.3, sqlite)	21s
testsuite (8.3, mysql)	38s
testsuite (8.3, pgsql)	25s
	10m 24s

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