Image Embedder: Use Variable.make

[janezd]

Issue

Embedder does not use Variable.make, so variables from different embeddings are incompatible. This problem occurs only on older versions of Orange, which still use make.

Includes

• [X] Code changes
• [ ] Tests
• [ ] Documentation

[codecov[bot]]

Codecov Report

Merging #163 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   61.65%   61.65%           
=======================================
  Files          13       13           
  Lines        3234     3234           
  Branches      481      481           
=======================================
  Hits         1994     1994           
  Misses       1116     1116           
  Partials      124      124