Fix formatting and add an INBOUNDS_VEC

If `setactivitytext` was the last line in a script,
the command would index the vector out of bounds.

I also modified the formatting to keep consistent
with the rest of the codebase.

desktop_version/src/Entity.cpp

@@ -1056,7 +1056,9 @@ void entityclass::createblock( int t, int xp, int yp, int w, int h, int trig /*=
             if (custom)
             {
                 block.prompt = "Press %s to interact";
-            } else {
+            }
+            else
+            {
                 block.prompt = "Press %s to activate terminal";
             }
             block.script = "custom_"+customscript;