Remove strict mode from Interfaces

[groenroos]

As part of #222 and #247, all instances of strict mode were removed. However, the linter is told to ignore Interface files, so the strict mode declarations there remained.

[codecov]

Codecov Report

Merging #266 (283d80c) into master (304b88e) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
- Coverage   96.66%   96.65%   -0.01%     
==========================================
  Files          35       35              
  Lines        4344     4340       -4     
==========================================
- Hits         4199     4195       -4     
  Misses        145      145              

Impacted Files	Coverage Δ
drivers/db/Interface.js	100.00% <ø> (ø)
drivers/render/Interface.js	100.00% <ø> (ø)

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