home: direnv: lib: fix shellcheck directive

I like it better with a space in it.

flake.lock

@@ -136,11 +136,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1728337164,
-        "narHash": "sha256-VdRTjJFyq4Q9U7Z/UoC2Q5jK8vSo6E86lHc2OanXtvc=",
+        "lastModified": 1729551526,
+        "narHash": "sha256-7LAGY32Xl14OVQp3y6M43/0AtHYYvV6pdyBcp3eoz0s=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "038630363e7de57c36c417fd2f5d7c14773403e4",
+        "rev": "5ec753a1fc4454df9285d8b3ec0809234defb975",
         "type": "github"
       },
       "original": {
@@ -152,11 +152,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1728241625,
-        "narHash": "sha256-yumd4fBc/hi8a9QgA9IT8vlQuLZ2oqhkJXHPKxH/tRw=",
+        "lastModified": 1729413321,
+        "narHash": "sha256-I4tuhRpZFa6Fu6dcH9Dlo5LlH17peT79vx1y1SpeKt0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c31898adf5a8ed202ce5bea9f347b1c6871f32d1",
+        "rev": "1997e4aa514312c1af7e2bda7fad1644e778ff26",
         "type": "github"
       },
       "original": {
@@ -168,11 +168,11 @@
     },
     "nur": {
       "locked": {
-        "lastModified": 1728385750,
-        "narHash": "sha256-M2Qgz4Opif8uN9/I/dWRtyZRcuHRv+02B1+FgJk6LyY=",
+        "lastModified": 1729688743,
+        "narHash": "sha256-Oe1PRxUAXSwRUcRIH+saPgMsIEEm7PfL81+M5IDCqvg=",
         "owner": "nix-community",
         "repo": "NUR",
-        "rev": "7fc13fc5ea634482f96525f06132646d5aa01f7f",
+        "rev": "2680c1d6af171ee32198c8f2f5dc07ce1d5bd2ea",
         "type": "github"
       },
       "original": {
@@ -194,11 +194,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1728092656,
-        "narHash": "sha256-eMeCTJZ5xBeQ0f9Os7K8DThNVSo9gy4umZLDfF5q6OM=",
+        "lastModified": 1729104314,
+        "narHash": "sha256-pZRZsq5oCdJt3upZIU4aslS9XwFJ+/nVtALHIciX/BI=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "1211305a5b237771e13fcca0c51e60ad47326a9a",
+        "rev": "3c3e88f0f544d6bb54329832616af7eb971b6be6",
         "type": "github"
       },
       "original": {