Fix a bug that the code diff hunk missing one at

Author: lunny

services/gitdiff/gitdiff.go

@@ -290,7 +290,7 @@ func (diffSection *DiffSection) GetComputedInlineDiffFor(diffLine *DiffLine, loc
 	// try to find equivalent diff line. ignore, otherwise
 	switch diffLine.Type {
 	case DiffLineSection:
-		return getLineContent(diffLine.Content[1:], locale)
+		return getLineContent(diffLine.Content, locale)
 	case DiffLineAdd:
 		compareDiffLine := diffSection.GetLine(diffLine.Match)
 		return diffSection.getDiffLineForRender(DiffLineAdd, compareDiffLine, diffLine, locale)