Drop check for base64 encoded strings

[patrickrobrecht]

As the check does not work properly and the fix #95 still causes false positives, I propose to drop this check completely. Later we should implement a checksum-based check (#82).

This is an alternative to #95.

[codecov-io]

Codecov Report

Merging #100 (e07c38b) into develop (a704e09) will decrease coverage by 0.48%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop     #100      +/-   ##
=============================================
- Coverage      39.92%   39.43%   -0.49%     
+ Complexity       144      143       -1     
=============================================
  Files              5        5              
  Lines            541      535       -6     
=============================================
- Hits             216      211       -5     
+ Misses           325      324       -1     

Impacted Files	Coverage Δ	Complexity Δ
inc/class-antivirus-checkinternals.php	43.11% <0.00%> (-2.10%)	34.00 <0.00> (-1.00)

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[stklcode]

I'm fine with the dropping this check.