qt: Wrap tooltips in the intro window

Summary: This is a backport of [[bitcoin-core/gui#20 | core-gui#20]]

Test Plan:
Open the intro window and check that the tooltips are wrapped (hover the cursor on the "enable pruning" checkbox)
`src/qt/bitcoin-qt --regtest -choosedatadir`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10676

src/qt/bitcoin.cpp

@@ -643,6 +643,11 @@ int GuiMain(int argc, char *argv[]) {
  return EXIT_SUCCESS;
  }
 
+ // Install global event filter that makes sure that long tooltips can be
+ // word-wrapped
+ app.installEventFilter(
+ new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
+
  /// 5. Now that settings and translations are available, ask user for data
  /// directory. User language is set up: pick a data directory.
  bool did_show_intro = false;
@@ -739,10 +744,6 @@ int GuiMain(int argc, char *argv[]) {
 #endif // ENABLE_WALLET
 
  /// 9. Main GUI initialization
- // Install global event filter that makes sure that long tooltips can be
- // word-wrapped.
- app.installEventFilter(
- new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
  // Install global event filter that makes sure that out-of-focus labels do
  // not contain text cursor.
  app.installEventFilter(new GUIUtil::LabelOutOfFocusEventFilter(&app));