correct robocop issue columns are 1 based

Author: d-biehl

robotcode/language_server/robotframework/parts/robocop_diagnostics.py

@@ -102,8 +102,8 @@ def collect(
             for issue in issues:
                 d = Diagnostic(
                     range=Range(
-                        start=Position(line=max(0, issue.line - 1), character=issue.col),
-                        end=Position(line=max(0, issue.end_line - 1), character=issue.end_col),
+                        start=Position(line=max(0, issue.line - 1), character=max(0, issue.col - 1)),
+                        end=Position(line=max(0, issue.end_line - 1), character=max(0, issue.end_col - 1)),
                     ),
                     message=issue.desc,
                     severity=DiagnosticSeverity.INFORMATION