Update icon.rs

[vanillajonathan]

Adds couple file extensions.

.cypher - Cypher, a query language
.malloy - Malloy, a query language
.kusto - Kusto Query Language
.rq - SPARQL, a query language

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[codecov-commenter]

Codecov Report

Merging #946 (60fbdb1) into master (89659e4) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #946   +/-   ##
=======================================
  Coverage   85.76%   85.76%           
=======================================
  Files          51       51           
  Lines        5001     5001           
=======================================
  Hits         4289     4289           
  Misses        712      712           

Files	Coverage Δ
src/theme/icon.rs	100.00% <ø> (ø)

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