radiosondesettings: Initialize RadiosondeSettings workspace index

Initialize the previously uninitialized m_workspaceIndex member to zero to
eliminate the cppcheck UNINIT_CTOR warning and ensure the workspace index
starts in a defined state.

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

plugins/feature/radiosonde/radiosondesettings.cpp

@@ -36,7 +36,8 @@ const QStringList RadiosondeSettings::m_pipeURIs = {
 };
 
 RadiosondeSettings::RadiosondeSettings() :
-    m_rollupState(nullptr)
+    m_rollupState(nullptr),
+    m_workspaceIndex(0)
 {
     resetToDefaults();
 }