Prevent BT LE Mtu exchange from triggering RSSI read

The commit introdocing RSSI read for Android
bc6e4e2860
seems to miss a 'break' statement when checking
BT LE (central) job type, causing MTU exchange to
also perform an RSSI read.

Pick-to: 6.7 6.5
Change-Id: I6746148b39dc11af6527efd8b41d25940a93ca49
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 86b957da94)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/android/bluetooth/src/org/qtproject/qt/android/bluetooth/QtBluetoothLE.java

@@ -1543,6 +1543,7 @@ class QtBluetoothLE {
                 break;
             case Mtu:
                 skip = executeMtuExchange();
+                break;
             case Rssi:
                 skip = executeRemoteRssiRead();
                 break;