Remove unused fields

.github/ISSUE_TEMPLATE/command_bug.yml

@@ -1,8 +1,6 @@
 name: Bug reports for commands
 description: For bugs that involve commands found within Red.
-title: ''
 labels: 'Type: Bug'
-assignees: ''
 body:
 - type: markdown
   attributes:

.github/ISSUE_TEMPLATE/enhancements.yml

@@ -1,8 +1,6 @@
 name: Enhancement proposal
 description: For feature requests and improvements related to already existing functionality.
-title: ''
 labels: 'Type: Enhancement'
-assignees: ''
 body:
 - type: markdown
   attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,8 +1,6 @@
 name: Feature request
 description: For feature requests regarding Red itself.
-title: ''
 labels: 'Type: Feature'
-assignees: ''
 body:
 - type: markdown
   attributes:

.github/ISSUE_TEMPLATE/other_bugs.yml

@@ -1,8 +1,6 @@
 name: Bug report
 description: "For bugs that don't involve a command."
-title: ''
 labels: 'Type: Bug'
-assignees: ''
 body:
 - type: markdown
   attributes: