Removed outdated UTF8 declaration [ Other ] (#24528)

* Removed outdated UTF8 declaration

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Gui/Macro.cpp

@@ -99,7 +99,6 @@ bool MacroFile::commit()
     }
 
     QString header;
-    header += QStringLiteral("# -*- coding: utf-8 -*-\n\n");
     header += QStringLiteral("# Macro Begin: ");
     header += this->macroName;
     header += QStringLiteral(" +++++++++++++++++++++++++++++++++++++++++++++++++\n");