Add non-breaking space back to PHPC display_name

Author: jmikola

.evergreen/config.yml

@@ -625,15 +625,15 @@ axes:
     display_name: Driver Version
     values:
       - id: "oldest-supported"
-        display_name: "PHPC 1.14.0"
+        display_name: "PHPC 1.14.0"
         variables:
           EXTENSION_VERSION: "1.14.0"
       - id: "latest-stable"
-        display_name: "PHPC (stable)"
+        display_name: "PHPC (stable)"
         variables:
           EXTENSION_VERSION: "stable"
       - id: "latest-dev"
-        display_name: "PHPC (master)"
+        display_name: "PHPC (master)"
         variables:
           EXTENSION_BRANCH: "master"