Fix getprop Format

getprop used to output a colon after the property name like:
[property.name]: [property.value]

Add back the colon that was missing, because
com.android.ddmlib.GetPropReceiver's regex expects it. Without
the colon, the GetPropReceiver doesn't parse the device's
properties causing CTS to not recognize the device.

Change-Id: I9bef5ab2b310c831c49c8c51cae7f129167c2dc5

toolbox/getprop.c

@@ -10,7 +10,7 @@ static void record_prop(const char* key, const char* name, void* opaque)
 {
     strlist_t* list = opaque;
     char temp[PROP_VALUE_MAX + PROP_NAME_MAX + 16];
-    snprintf(temp, sizeof temp, "[%s] [%s]", key, name);
+    snprintf(temp, sizeof temp, "[%s]: [%s]", key, name);
     strlist_append_dup(list, temp);
 }