aprs: Fix out-of-bounds access when parsing BITS telemetry

cppcheck reported a possible out-of-bounds access in the BITS telemetry
message parser. The bounds check was reversed, causing m_message[i] to
be accessed when i was beyond the end of the string.

Correct the condition so missing bit sense values continue to use the
existing default value.

Signed-off-by: Robin Getz <rgetz503@gmail.com>

sdrbase/util/aprs.cpp

@@ -953,7 +953,7 @@ bool APRSPacket::parseMessage(QString& info, int& idx)
         int i = 5;
         for (int j = 0; j < 8; j++)
         {
-            if (i >= m_message.length())
+            if (i < m_message.length())
                 m_telemetryBitSense[j] = m_message[i] == '1';
             else
                 m_telemetryBitSense[j] = true;