pgAdmin 4 commit: Fix query tool horizontal scrolling of results. Fixes

Fix query tool horizontal scrolling of results. Fixes #1362

The backgrid-sizeable's css property 'overflow: hidden' was overriding backgrid table css property and It was
reproducibleonly in runtime. 
Removed 'overflow: hidden' property from backgrid-sizeabled-columns.css

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=e881695050b8ba4cf99b365ff2c0f4e02d03ced6
Author: Surinder Kumar <surinder.kumar@enterprisedb.com>

Modified Files
--------------
web/pgadmin/static/css/backgrid/backgrid-sizeable-columns.css | 1 -
web/pgadmin/static/js/backform.pgadmin.js                     | 5 +----
2 files changed, 1 insertion(+), 5 deletions(-)