Fixed architectures in manifest.json for older builds.

manifest.json

@@ -27,7 +27,7 @@
     {
       "files": [
         {
-          "arch": "linux-x86_64",
+          "arch": "x86_64-linux",
           "checksum": "430afb894801200c3fcf4123e3bb17006b369c25bc59c39bf04b4bcafeb96ee6",
           "url": "https://github.com/lite-xl/lite-xl/releases/download/v2.1.7/lite-xl-v2.1.7-linux-x86_64-portable.tar.gz"
         }
@@ -38,7 +38,7 @@
     {
       "files": [
         {
-          "arch": "linux-x86_64",
+          "arch": "x86_64-linux",
           "checksum": "13523ff6713dc839338fd306263f714d13a062a4a718a01df12f0d3fd98a187f",
           "url": "https://github.com/lite-xl/lite-xl/releases/download/v2.1.6/lite-xl-v2.1.6-linux-x86_64-portable.tar.gz"
         }
@@ -49,7 +49,7 @@
     {
       "files": [
         {
-          "arch": "linux-x86_64",
+          "arch": "x86_64-linux",
           "checksum": "ae1ad1a5fa5820a812f83e0624d1198b349f55045f3ec045e292fcefa542eab0",
           "url": "https://github.com/lite-xl/lite-xl/releases/download/v2.1.5/lite-xl-v2.1.5-linux-x86_64-portable.tar.gz"
         }