Rename updateIndex to dryRun to better reflect its use

src/tools/tomahawk-test-musicscan/main.cpp

@@ -48,7 +48,7 @@ main( int argc, char* argv[] )
 
         // We want a dry-run of the scanner and not update any internal data.
         scanner.showProgress( false );
-        scanner.updateIndex( false );
+        scanner.setDryRun( true );
         scanner.setVerbose( true );
 
         // Start the MusicScanner in its own thread