Clear interrupted flag in AppEngineWizardPage#addPages()

[briandealwis]

Towards #2064

[chanseokoh]

Okay, let's try this.

[codecov-io]

Codecov Report

Merging #2137 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #2137      +/-   ##
============================================
+ Coverage     65.59%   65.61%   +0.01%     
  Complexity     1843     1843              
============================================
  Files           323      323              
  Lines         12401    12402       +1     
  Branches       1164     1164              
============================================
+ Hits           8134     8137       +3     
+ Misses         3836     3833       -3     
- Partials        431      432       +1

Impacted Files	Coverage Δ	Complexity Δ
...e/appengine/newproject/AppEngineProjectWizard.java	67.3% <100%> (+0.64%)	6 <1> (ø)	⬇️
...raries/persistence/SerializableClasspathEntry.java	79.62% <0%> (-1.86%)	16% <0%> (-1%)
...calAppEngineServerLaunchConfigurationDelegate.java	60.91% <0%> (+0.35%)	35% <0%> (ø)	⬇️
.../appengine/standard/java8/AppEngineWebBuilder.java	79.62% <0%> (+3.7%)	11% <0%> (+1%)	⬆️

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