mtx: fix static fromTX.

[nodech]

No description provided.

[codecov-io]

Codecov Report

Merging #296 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #296      +/-   ##
=========================================
+ Coverage    57.8%   57.8%   +<.01%     
=========================================
  Files         129     129              
  Lines       35794   35794              
  Branches     6032    6032              
=========================================
+ Hits        20690   20692       +2     
+ Misses      15104   15102       -2

Impacted Files	Coverage Δ
lib/primitives/mtx.js	68.38% <0%> (ø)	⬆️
lib/script/script.js	59.4% <0%> (+0.08%)	⬆️
lib/covenants/rules.js	70.57% <0%> (+0.14%)	⬆️

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[boymanjor]

LGTM