Fix #2196, resolve static analysis errors in tbl_UT.c

[jphickey]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
Resolves two uninitialized variable errors reported in the workflow.

Fixes #2196

Testing performed
Build and run all tests
Run workflow

Expected behavior changes
Passes static analysis, no behavior change.

System(s) tested on
Updated Github workflow (with nasa/cFS#607)

Contributor Info - All information REQUIRED for consideration of pull request
Joseph Hickey, Vantage Systems, Inc.

[jphickey]

Running the latest static analysis workflow revealed the following additional style errors (this is from the "strict" set that does not occur at the bundle level workflow).

severity	file	line	issue
style	modules/fs/fsw/src/cfe_fs_api.c	142	Condition '((char)(&EndianCheck))==0x04' is always false
style	modules/fs/fsw/src/cfe_fs_api.c	234	Condition '((char)(&EndianCheck))==0x04' is always false
style	modules/fs/fsw/src/cfe_fs_api.c	249	Condition '((char)(&EndianCheck))==0x04' is always false
style	modules/fs/fsw/src/cfe_fs_api.c	293	Condition '((char)(&EndianCheck))==0x04' is always false
style	modules/sb/fsw/src/cfe_sb_priv.h	567	Parameter 'List' can be declared with const
style	modules/sb/fsw/src/cfe_sb_priv.h	567	Parameter 'Node' can be declared with const
style	modules/tbl/fsw/src/cfe_tbl_internal.c	1116	Condition '((char)&EndianCheck)==0x04' is always false

[jphickey]

Clean cppcheck run observed in: https://github.com/nasa/cFE/actions/runs/3386994564

[jphickey]

Updated commit includes style fixes, so this should pass static analysis after nasa/cFS#607 gets merged.