fix mistakes in oracle_database_tables.sql

[jdyer1]

Fix some little issues in oracle_database_tables.sql wrt the client_details table.

• remove duplicated column "software_statement".
• add column "software_version" as a varchar2 length 2048 (cf. hsql and mysql scripts)
• fix columns "software_statement" and "software_id", should be type "varchar2" not "varchar", length 4000 (maximum allowed by oracle)
• remove dangling comma in "saved_user_auth" table creation

[codecov-io]

Codecov Report

Merging #1486 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1486   +/-   ##
=========================================
  Coverage     25.21%   25.21%           
  Complexity      912      912           
=========================================
  Files           209      209           
  Lines         11689    11689           
  Branches       2116     2116           
=========================================
  Hits           2947     2947           
  Misses         8227     8227           
  Partials        515      515

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