Fix an error when executing run_tests.sh

In the recent commit I1473fe4da96aecd0b3b0bf3a3ec1e3e87039271b , the
coverage option was introduced. But there are a few typos in the shell
script.
This commit fixes it.

Change-Id: Iecdd72f730c0f0971424ca48e6f122481493b1ee
Closes-Bug: #1268808
diff --git a/run_tests.sh b/run_tests.sh
index 285b372..3f00453 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -126,7 +126,7 @@
     exit
 fi
 
-if [$coverage -eq 1] ; then
+if [ $coverage -eq 1 ]; then
     $testrargs = "--coverage $testrargs"
 fi