Enable blocking read of the git output by default

This solves trimmed output like in IDEA-96461,
it probably used to cause hangs in some cases, but the process handler
had many improvements since then, so hopefully no more hangs should
appear. If they do, the change will be rolled back.

platform/util/resources/misc/registry.properties

@@ -685,7 +685,7 @@ database.src_storage.enabled.description=Enables database sources storage
 database.src_storage.enabled=false
 
 git.status.write=true
-git.blocking.read=false
+git.blocking.read=true
 git.file.history.full=true
 git.file.history.full.description=Adds "--full-history --simplify-merges" to git log arguments when retrieving history for a file. \
    This may sometimes result in empty merges being shown in the file history. \