Fix trying to open every file as a repo (close #621)

[dbausch]

The code missed an "await" at the place where the new isSvnFolder
function is used. Function isSvnFolder always returns a valid
Promise, which was treated like a boolean "true" in the "if".

[codecov]

Codecov Report

Merging #625 into master will decrease coverage by 0.63%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #625      +/-   ##
==========================================
- Coverage   57.12%   56.49%   -0.64%     
==========================================
  Files         117      117              
  Lines        4397     4397              
  Branches      646      634      -12     
==========================================
- Hits         2512     2484      -28     
- Misses       1651     1673      +22     
- Partials      234      240       +6

Impacted Files	Coverage Δ
src/model.ts	60.25% <100%> (ø)	⬆️
src/svnFinder.ts	62.71% <0%> (-16.95%)	⬇️
src/svnError.ts	55.55% <0%> (-16.67%)	⬇️
src/util.ts	73.78% <0%> (-5.83%)	⬇️
src/svn.ts	77.98% <0%> (-3.67%)	⬇️
src/commands/command.ts	50% <0%> (-1.5%)	⬇️
src/repository.ts	60.13% <0%> (-0.44%)	⬇️

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[JohnstonCode]

Thanks!

[JohnstonCode]

🎉 This PR is included in version 1.54.3 🎉

The release is available on:

• Visual Studio Marketplace
• GitHub release

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