gui: use PACKAGE_NAME in exception message
gui: use PACKAGE_NAME in exception message

Summary: This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/18646 | PR18646]]

Test Plan:
```
diff --git a/src/qt/modaloverlay.cpp b/src/qt/modaloverlay.cpp
index e5f32fe12..c5686cc0d 100644
--- a/src/qt/modaloverlay.cpp
+++ b/src/qt/modaloverlay.cpp
@@ -7,6 +7,7 @@

 #include <chainparams.h>
 #include <qt/guiutil.h>
+#include <util/check.h>

 #include <QPropertyAnimation>
 #include <QResizeEvent>
@@ -197,6 +198,7 @@ void ModalOverlay::showHide(bool hide, bool userRequested) {
 }

 void ModalOverlay::closeClicked() {
+    CHECK_NONFATAL(false);
     showHide(true);
     userClosed = true;
 }
```
Running  `bitcoin-qt` and clicking Hide in the modal causes the exception dialog to appear. Check that it includes "Bitcoin ABC".

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8928

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