IDEA-56814 git: fix encoding issues in annotations

* We use same encoding to parse file content and git meta information.
  After a7c864a we no longer use file content, so this hack is no longer required.
* This fixes parse error on files in UTF-16
* This fixes parsing of non-ascii names

plugins/git4idea/src/git4idea/annotate/GitAnnotationProvider.java

@@ -155,7 +155,6 @@ public class GitAnnotationProvider implements AnnotationProviderEx {
     VirtualFile root = GitUtil.getGitRoot(repositoryFilePath);
     GitSimpleHandler h = new GitSimpleHandler(myProject, root, GitCommand.BLAME);
     h.setStdoutSuppressed(true);
-    h.setCharset(file.getCharset());
     h.addParameters("--porcelain", "-l", "-t", "-w");
     if (revision == null) {
       h.addParameters("HEAD");