Disable the page cache bulk allocation for the shrink.test and wal.test

modules.

FossilOrigin-Name: 3418f1f165a0746cdf130e6a19fa0e1eb56df1d4

test/shrink.test

@@ -15,6 +15,7 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+test_set_config_pagecache 0 0
 
 unset -nocomplain baseline
 do_test shrink-1.1 {
@@ -43,4 +44,5 @@ do_test shrink-1.3 {
   expr {$::baseline > [sqlite3_memory_used]+500000}
 } {1}
 
+test_restore_config_pagecache
 finish_test

test/wal.test

@@ -22,6 +22,7 @@ source $testdir/wal_common.tcl
 set testprefix wal
 
 ifcapable !wal {finish_test ; return }
+test_set_config_pagecache 0 0
 
 proc reopen_db {} {
   catch { db close }
@@ -1587,4 +1588,5 @@ foreach mode {OFF MEMORY PERSIST DELETE TRUNCATE WAL} {
   db close
 }
 
+test_restore_config_pagecache
 finish_test