Renamed test file to follow camel casing convention

Author: egregius313

java/ql/test/query-tests/security/CWE-094/APKInstallation.java renamed to java/ql/test/query-tests/security/CWE-094/ApkInstallation.java

@@ -5,7 +5,7 @@
 
 import java.io.File;
 
-public class APKInstallation extends Activity {
+public class ApkInstallation extends Activity {
     static final String APK_MIMETYPE = "application/vnd.android.package-archive";
 
     public void installAPK(String path) {