theme: oscar - remove dust (comes from PR #1671 implementation)

was inadvertently included in the commit [1]

[1] https://github.com/asciimoo/searx/commit/f34ac58752b3857468d01c79d7bc3409e8b03fe3#diff-0243d1c24e9981002156cc87cc10bd53R103



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>