Adjust the memsubsys1-5.5 test case to avoid occasional false positives.

FossilOrigin-Name: 432413187f41061a08ecff2697ce85c935fa6fa8

test/memsubsys1.test

@@ -176,13 +176,13 @@ do_test memsubsys1-4.6 {
   set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
 } 1
 
-# Test 5:  Activate both PAGECACHE and SCRATCH.  But make the page size
+# Test 5:  Activate both PAGECACHE and SCRATCH.  But make the page size is
 # such that the SCRATCH allocations are too small.
 #
 db close
 sqlite3_shutdown
 sqlite3_config_pagecache [expr 4096+$xtra_size] 24
-sqlite3_config_scratch 6000 2
+sqlite3_config_scratch 4000 2
 sqlite3_initialize
 reset_highwater_marks
 build_test_db memsubsys1-5 {PRAGMA page_size=4096}