fix: selection algo filtering on max price fixed

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What does this pull request do? Explain your changes. (required)

Fixes behavior of gateway when no max price is set. 0 maxPrice will return to being no max price filter enabled.

The addition of maxPricePerCapability included initializing a zero max price by default so the map is fully initialized. This broke the filterByMaxPrice function that checked for an unset maxPrice of nil. Specific updates (required)

• updates filterByMaxPrice function in selection_algorithm.go to check for 0 rather than checking for nil
• added test to cover this so will fail in future if behavior of max price filtering changes
• updated TestFilter test to set a maxPrice of 0 if none set

How did you test each of these updates (required)

Added new test and ran all tests in selection_algorithm_test.go

Does this pull request close any open issues?

Checklist:

• [ ] Read the contribution guide
• [X] make runs successfully
• [ ] All tests in ./test.sh pass X selection_algorithm_test.go pass.
• [ ] README and other documentation updated
• [ ] Pending changelog updated

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 30.56667%. Comparing base (0cf87dc) to head (181d727).

Additional details and impacted files

@@              Coverage Diff              @@
##              master       #3179   +/-   ##
=============================================
  Coverage   30.56667%   30.56667%           
=============================================
  Files            152         152           
  Lines          45494       45494           
=============================================
  Hits           13906       13906           
  Misses         30770       30770           
  Partials         818         818           

Files with missing lines	Coverage Δ
server/selection_algorithm.go	90.58824% <100.00000%> (ø)

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Files with missing lines	Coverage Δ
server/selection_algorithm.go	90.58824% <100.00000%> (ø)

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