SCUMM: v7-8: Remove all blast texts before loading a savestate

This fixes an issue in COMI, in which bringing up the recipe book and then pulling it down
left the recipe texts on screen on the new room for several frames.

engines/scumm/saveload.cpp

@@ -544,6 +544,13 @@ bool ScummEngine::loadState(int slot, bool compat, Common::String &filename) {
 	sb = _screenB;
 	sh = _screenH;
 
+#ifdef ENABLE_SCUMM_7_8
+	// Remove any blast text leftovers
+	if (_game.version >= 7) {
+		((ScummEngine_v7 *)this)->removeBlastTexts();
+	}
+#endif
+
 	// Restore the virtual screens and force a fade to black.
 	initScreens(0, _screenHeight);