Fix gap between vulnerability list and filters
On the vulnerability report:
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Recently, the default style of the table was changed in #346921 (closed), which adds a top border to the table that wasn't there before. This makes the vulnerability table look a bit odd with just white space in between two borders. This MR removes the white space gap:
| Before | After |
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Related to #346921 (closed)
Edited by Daniel Tian