Ports/mrsh: Fix workdir, remove or upgrade patches

Also removes mrsh from the list of ports missing descriptions. I tried
to be descriptive about the patches, but as I picked this port up from
someone else, I'm not 100% sure how to best explain the patches.

Ports/mrsh/patches/0002-Hardcode-default-path-because-confstr-is-missing.patch

@@ -0,0 +1,41 @@
+From f254a0f09c9382deb6d2eb7497b453896b9a662f Mon Sep 17 00:00:00 2001
+From: EWouters <6179932+EWouters@users.noreply.github.com>
+Date: Tue, 12 Apr 2022 18:00:04 +0200
+Subject: [PATCH 2/4] Hardcode default path because `confstr` is missing
+
+---
+ shell/path.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/shell/path.c b/shell/path.c
+index 3c2bf65..ee2c4e9 100644
+--- a/shell/path.c
++++ b/shell/path.c
+@@ -26,18 +26,24 @@ char *expand_path(struct mrsh_state *state, const char *file, bool exec,
+ 			return NULL;
+ 		}
+ 	} else {
++#ifndef __serenity__
+ 		size_t pathe_size = confstr(_CS_PATH, NULL, 0);
+ 		if (pathe_size == 0) {
+ 			return NULL;
+ 		}
+ 		pathe = malloc(pathe_size);
++#else
++		pathe = strdup("/bin:/usr/bin");
++#endif
+ 		if (pathe == NULL) {
+ 			return NULL;
+ 		}
++#ifndef __serenity__
+ 		if (confstr(_CS_PATH, pathe, pathe_size) != pathe_size) {
+ 			free(pathe);
+ 			return NULL;
+ 		}
++#endif
+ 	}
+ 
+ 	char *path = NULL;
+-- 
+2.32.0 (Apple Git-132)
+