CB-12643 : removed references to wp8

[audreyso]

Platforms affected

What does this PR do?

Removed references to wp8.

What testing has been done on this change?

Checklist

• Reported an issue in the JIRA database
• Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
• Added automated test coverage as appropriate for this change.

[codecov-io]

Codecov Report

Merging #539 into master will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   82.42%   82.58%   +0.16%     
==========================================
  Files          68       66       -2     
  Lines        5462     5283     -179     
  Branches     1072     1051      -21     
==========================================
- Hits         4502     4363     -139     
+ Misses        960      920      -40

Impacted Files	Coverage Δ
cordova-lib/src/cordova/platform.js	77.9% <ø> (+0.12%)	⬆️
cordova-lib/src/util/windows/csproj.js	63.73% <0%> (-2.2%)	⬇️
cordova-lib/src/cordova/metadata/wp8_parser.js

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