add missing status fields and fix game-of-life prerequisite (#3113)

- Six concept exercises (logs-logs-logs, tim-from-marketing, captains-log,
  booking-up-for-beauty, secrets, international-calling-connoisseur) were
  missing an explicit status field in config.json, so promoted each to active
- Promote calculator-conundrum and gotta-snatch-em-all from beta to active;
  both have complete test suites and have been in the track long enough
- Fix game-of-life prerequisite slug: 'if-statements' does not exist,
  the correct slug is 'if-else-statements'

Author: bull1210

config.json

@@ -95,7 +95,7 @@
           "if-else-statements",
           "switch-statement"
         ],
-        "status": "beta"
+        "status": "active"
       },
       {
         "slug": "squeaky-clean",
@@ -233,7 +233,8 @@
           "strings",
           "switch-statement",
           "constructors"
-        ]
+        ],
+        "status": "active"
       },
       {
         "slug": "tim-from-marketing",
@@ -245,7 +246,8 @@
         "prerequisites": [
           "if-else-statements",
           "strings"
-        ]
+        ],
+        "status": "active"
       },
       {
         "slug": "captains-log",
@@ -258,7 +260,8 @@
           "arrays",
           "numbers",
           "strings"
-        ]
+        ],
+        "status": "active"
       },
       {
         "slug": "booking-up-for-beauty",
@@ -270,7 +273,8 @@
         "prerequisites": [
           "numbers",
           "strings"
-        ]
+        ],
+        "status": "active"
       },
       {
         "slug": "wizards-and-warriors-2",
@@ -295,7 +299,8 @@
         ],
         "prerequisites": [
           "numbers"
-        ]
+        ],
+        "status": "active"
       },
       {
         "slug": "gotta-snatch-em-all",
@@ -308,7 +313,7 @@
           "lists",
           "generic-types"
         ],
-        "status": "beta"
+        "status": "active"
       },
       {
         "slug": "international-calling-connoisseur",
@@ -321,7 +326,8 @@
           "classes",
           "foreach-loops",
           "generic-types"
-        ]
+        ],
+        "status": "active"
       }
     ],
     "practice": [
@@ -981,7 +987,7 @@
         "practices": [],
         "prerequisites": [
           "arrays",
-          "if-statements"
+          "if-else-statements"
         ],
         "difficulty": 5
       },