refactor: remove <util/system.h> include from wallet.h

Since we no longer store a ref to the global `ArgsManager`
inside the wallet, we can move the util/system.h
include to the cpp.

This dependency removal opened a can of worms, as few
other places were, invalidly, depending on the wallet's
header including it.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index e36fbc5b31..ccab9c19ad 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -98,6 +98,9 @@ public:
     bool getEnablePSBTControls() const { return m_enable_psbt_controls; }
     const QString& getOverriddenByCommandLine() { return strOverriddenByCommandLine; }
 
+    /** Whether -signer was set or not */
+    bool hasSigner();
+
     /* Explicit setters */
     void SetPruneTargetGB(int prune_target_gb);