Fix ant build error

Fix the following error that causes the build to fail:

```
test:
[getlibpath] Library dependencies:
[getlibpath] No Libraries
     [echo] Running tests...
     [echo] Running tests ...
     [exec] 
     [exec] Error: Failed to generate emma coverage. 
     [echo] Setting permission to download the coverage file...
     [exec] run-as: Package 'org.tribler.tsap' is unknown
     [echo] Downloading coverage file into project directory...
     [exec] remote object '/sdcard/org.tribler.tsap/coverage.ec' does not exist

BUILD FAILED
/home/jenkins/workspace/Build_Test-TSAP_Android_master/ant-build.xml:1298: exec returned: 1
```