fix(dsc): remove incorrect return argument in resources

relates to #6882

Author: JanDeDobbeleer

packages/msi/dsc/oh-my-posh.config.dsc.resource.json

@@ -32,7 +32,6 @@
   "set": {
     "executable": "oh-my-posh",
     "implementsPretest": true,
-    "return": "stateAndDiff",
     "args": [
       "config",
       "dsc",

packages/msi/dsc/oh-my-posh.font.dsc.resource.json

@@ -32,7 +32,6 @@
   "set": {
     "executable": "oh-my-posh",
     "implementsPretest": true,
-    "return": "stateAndDiff",
     "args": [
       "font",
       "dsc",

packages/msi/dsc/oh-my-posh.shell.dsc.resource.json

@@ -32,7 +32,6 @@
   "set": {
     "executable": "oh-my-posh",
     "implementsPretest": true,
-    "return": "stateAndDiff",
     "args": [
       "shell",
       "dsc",