Fix jacoco filters

Add space after -x argument for jacoco excludes.
Add .class to end of file name for jacoco includes.

Bug: 64836607
Test: jacoco_test.go
Change-Id: I4c1024755882c976f7326f7382c4f2e99a20233d
diff --git a/java/jacoco.go b/java/jacoco.go
index c4b3e6e..59f2fd3 100644
--- a/java/jacoco.go
+++ b/java/jacoco.go
@@ -76,7 +76,7 @@
 func jacocoFiltersToZipCommand(includes, excludes []string) string {
 	specs := ""
 	if len(excludes) > 0 {
-		specs += android.JoinWithPrefix(excludes, "-x") + " "
+		specs += android.JoinWithPrefix(excludes, "-x ") + " "
 	}
 	if len(includes) > 0 {
 		specs += strings.Join(includes, " ")
@@ -113,6 +113,8 @@
 		spec += "**/*.class"
 	} else if wildcard {
 		spec += "*.class"
+	} else {
+		spec += ".class"
 	}
 
 	return spec, nil