Ensure tag used for logging on Android does not contain spaces

Tag passed to __android_log_print shouldn't contain spaces because
filter-spec used by adb logcat expects space-separeate list of
tag:priority specifiers. Effectively, its not possible to filter tag
using logcat if Qt's application name has spaces.

Pick-to: 6.2 6.3
Change-Id: I52b706b7a368d0700db45c0406bbfef279bc61fb
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/corelib/global/qlogging.cpp

@@ -1737,9 +1737,10 @@ static bool android_default_message_handler(QtMsgType type,
         break;
     };
 
+    // If application name is a tag ensure it has no spaces
     // If a category is defined, use it as an Android logging tag
     __android_log_print(priority, isDefaultCategory(context.category) ?
-                            qPrintable(QCoreApplication::applicationName()) : context.category,
+                        qPrintable(QCoreApplication::applicationName().replace(" ", "_")) : context.category,
                         "%s\n", qPrintable(formattedMessage));
 
     return true; // Prevent further output to stderr