cosmetic suggestions from GitHub Copilot

tools/lammps-gui/preferences.cpp

@@ -275,7 +275,6 @@ GeneralTab::GeneralTab(QSettings *_settings, LammpsWrapper *_lammps, QWidget *pa
     QWidget(parent), settings(_settings), lammps(_lammps)
 {
     auto *layout = new QGridLayout;
-    ;
 
     auto *echo = new QCheckBox("Echo input to output buffer");
     echo->setObjectName("echo");

tools/lammps-gui/stdcapture.h

@@ -33,8 +33,8 @@ public:
     double get_bufferuse() const;
 
 private:
-    enum PIPES { READ, WRITE, BUFSZ };
-    int m_pipe[BUFSZ];
+    enum PIPES { READ, WRITE, PIPE_COUNT };
+    int m_pipe[PIPE_COUNT];
     int m_oldStdOut;
     bool m_capturing;
     std::string m_captured;