The code in editeng, passing sal_True (= 1) into StorageMode, has been like that
ever since cd7096b4 "INTEGRATION: CWS
mav09: #i27773#: remove so3; new storage API" where SfxMedium ctor calls were
replaced with SotStorage ctor calls, keeping the argument lists intact.  And at
least way-back 5a9184d9 "INTEGRATION: CWS
hedaburemove01: #72503# get rid of hedabu procedure: Moving headers to
sfx2/inc/sfx2 and correspondent necessary changes" had a SfxMedium ctor that
took as 3rd param a sal_Bool bDirect.  That is, it looks like
cd7096b4 inadvertently carried the SfxMedium
bDirect arguments over as SotStorage StorageMode arguments.

Given further that even way-back e1e019fe
"INTEGRATION: CWS hedaburemove01: #72503# get rid of hedabu procedure: Moving
headers to sot/inc/sot and correspondent necessary changes" only defines
STORAGE_* values with values >= 0x02 (so sal_True would never have had any
effect), the best bet appears to just use the implicit default = 0 instead.

Change-Id: I3c19831433173657d3a3225c28398de7481fe036