RT#1026928/ISTWCMS-3548: Update to slack 7.x-1.7

uw_base_profile.make

@@ -1031,13 +1031,10 @@ projects[site_test][download][tag] = "7.x-1.5-uw_wcms1"
 projects[site_test][subdir] = "contrib"
 
 ; Slack
-; Base: ccf12a9 (7.x-1.6+2-dev)
-; Patch e3a2648: Remove lines added by packaging script.
-; Patch c208a22: Make icon type use default when not specified. https://www.drupal.org/node/2905941#comment-12242413
 projects[slack][type] = "module"
 projects[slack][download][type] = "git"
 projects[slack][download][url] = "https://git.uwaterloo.ca/drupal-org/slack.git"
-projects[slack][download][tag] = "7.x-1.6+2-dev-uw_wcms1"
+projects[slack][download][tag] = "7.x-1.7"
 projects[slack][subdir] = "contrib"
 
 ; Sliderfield