Merge #17998: gui: Shortcut to close ModalOverlay

1a638e1105 gui: Shortcut to close ModalOverlay (Emil Engler)

Pull request description:

  This adds the shortcut `Esc` to hide the ModalOverlay.
  The motivation is that it is annoying to always move the cursor to "Hide" when quickly testing something in the GUI with an outdated chain.

ACKs for top commit:
  kristapsk:
    ACK 1a638e1105. Agree with @promag, Esc feels more natural than Enter here.
  jonasschnelli:
    ACK 1a638e1105

Tree-SHA512: ea764349ec145ce9a34cbc66c3ac0eace9233a3fb3e9c22694a77882478afa22d4e686ce2c1d7b3938f6769f96ba995577b0216ba9d98954dcf3e55d2187f2e0

src/qt/forms/modaloverlay.ui

@@ -351,6 +351,9 @@ QLabel { color: rgb(40,40,40);  }</string>
              <property name="text">
               <string>Hide</string>
              </property>
+             <property name="shortcut">
+              <string>Esc</string>
+             </property>
              <property name="focusPolicy">
               <enum>Qt::StrongFocus</enum>
              </property>