gui: Explicitly call QSlider::setRange in LogSlider constructor

cppcheck identified that LogSlider::LogSlider() calls the derived
setRange(double, double) overload instead of QSlider::setRange(int, int)
due to C++ name hiding.

The constructor's call to:
    setRange(0, 1000);

was therefore invoking the logarithmic range implementation with
min == 0.0, resulting in a call to log10(0). While most callers
immediately replace the initial state by calling LogSlider::setRange()
with a valid positive range, the constructor still performs an invalid
mathematical operation during initialization.

Explicitly qualify the call as QSlider::setRange(0, 1000) to initialize
the underlying slider without invoking the logarithmic overload. This
eliminates the invalid-domain call, avoids undefined behavior from
propagating exceptional floating-point values into the slider state, and
makes the constructor's intent explicit.

This change has no functional impact on normal operation, but removes a
latent initialization bug and prevents future regressions caused by
overload hiding.

Signed-off-by: Robin Getz <rgetz503@gmail.com>

sdrgui/gui/logslider.cpp

@@ -30,7 +30,7 @@
 LogSlider::LogSlider(QWidget *parent) :
     QSlider(Qt::Horizontal, parent)
 {
-    setRange(0, 1000);
+    QSlider::setRange(0, 1000);
     connect(this, &QSlider::valueChanged, this, &LogSlider::handleValueChanged);
     setPageStep(1);
     setTickPosition(QSlider::TicksAbove);