[gui] load PSBT

co-authored-by: Glenn Willen <gwillen@nerdnet.org>

src/qt/walletview.h

@@ -83,6 +83,8 @@ public Q_SLOTS:
     void gotoSignMessageTab(QString addr = "");
     /** Show Sign/Verify Message dialog and switch to verify message tab */
     void gotoVerifyMessageTab(QString addr = "");
+    /** Load Partially Signed Bitcoin Transaction */
+    void gotoLoadPSBT();
 
     /** Show incoming transaction notification for new transactions.