Fix invalid condition on '-' taken idicator

On taken indicator '-' the current implementation of the  LcovParser was
setting the branch as executed and tried to convert the sign '-' to a number.
Doing so an exception was thrown. Just inverted the condition to fix the
problem.

tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator/LcovParser.java

@@ -280,7 +280,7 @@ private boolean parseBRDALine(String line) {
 
       boolean wasExecuted = false;
       int executionCount = 0;
-      if (taken.equals(TAKEN)) {
+      if (!taken.equals(TAKEN)) {
         executionCount = Integer.parseInt(taken);
         wasExecuted = true;
       }