Terminal: Fix build with QTC_STATIC_BUILD

The `log` Q_LOGGING_CATEGORY was used in a different place, and would
conflict in a static build.

Change-Id: Id23722a2aca3ea9afb846d8dd75aed9972c7b16f
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/terminal/terminalsurface.cpp

@@ -12,10 +12,10 @@
 
 #include <QLoggingCategory>
 
-Q_LOGGING_CATEGORY(log, "qtc.terminal.surface", QtWarningMsg);
-
 namespace Terminal::Internal {
 
+Q_LOGGING_CATEGORY(log, "qtc.terminal.surface", QtWarningMsg);
+
 QColor toQColor(const VTermColor &c)
 {
     return QColor(qRgb(c.rgb.red, c.rgb.green, c.rgb.blue));