Reset target paths list on each initialization of the configuration

Although not a problem for normal usage, the previous behavior of appending target paths on each call to
configuration.Initialize() interfered with the ability to use this function in multiple tests.

Author: per1234

configuration/configuration.go

@@ -83,6 +83,7 @@ func Initialize(flags *pflag.FlagSet, projectPaths []string) error {
 
 	versionMode, _ = flags.GetBool("version")
 
+	targetPaths = nil
 	if len(projectPaths) == 0 {
 		// Default to using current working directory.
 		workingDirectoryPath, err := os.Getwd()

configuration/configuration_test.go

@@ -184,17 +184,14 @@ func TestInitializeVersion(t *testing.T) {
 }
 
 func TestInitializeProjectPath(t *testing.T) {
-	targetPaths = nil
 	assert.Nil(t, Initialize(test.ConfigurationFlags(), []string{}))
 	workingDirectoryPath, err := os.Getwd()
 	require.Nil(t, err)
 	assert.Equal(t, paths.NewPathList(workingDirectoryPath), TargetPaths(), "Default PROJECT_PATH to current working directory")
 
-	targetPaths = nil
 	assert.Nil(t, Initialize(test.ConfigurationFlags(), projectPaths))
 	assert.Equal(t, paths.NewPathList(projectPaths[0]), TargetPaths())
 
-	targetPaths = nil
 	assert.Error(t, Initialize(test.ConfigurationFlags(), []string{"/nonexistent"}))
 }