PS: Remove unnecessary data extension pattern to fix warning

[MathiasVP]

@dilanbhalla reported this warning when running codeql database analyze:

WARNING: Pattern 'semmle/code/powershell/frameworks/**/model.yml' did not match any extension files. (microsoft/powershell-all/0.0.1/qlpack.yml:1,1-1)
WARNING: Pattern 'semmle/code/powershell/frameworks/**/typemodel.yml' did not match any extension files. (microsoft/powershell-all/0.0.1/qlpack.yml:1,1-1)
WARNING: Pattern 'semmle/code/powershell/frameworks/**/model.yml' did not match any extension files. (microsoft/powershell-all/0.0.1/qlpack.yml:1,1-1)
WARNING: Pattern 'semmle/code/powershell/frameworks/**/typemodel.yml' did not match any extension files. (microsoft/powershell-all/0.0.1/qlpack.yml:1,1-1)

These happen because the qlpack has specified that there are data extensions (i.e., .yml files) that match the pattern powershell/frameworks/**/model.yml, but no data extensions match this file name. This is because we recently changed the names of all the data extensions to be blablabla.model.yml (instead of blablabla/model.yml) to be more consistent with GitHub's directory structure.

By removing the two patterns that do not match any data extensions we will remove the warning.