fwk: Remove hx40 action, run hx30 on all branches

hx40 does not have its own firmware, it's the same as hx30, no need to
build separately.

Necessary to update the branch rules because we renamed the branch.

Remove pull_request trigger to avoid building every push twice.

TEST=should build hx20 and hx30 on github actions

Co-authored-by: Alexandru Stan <ams@frame.work>
Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

.github/workflows/hx20.yml

@@ -1,6 +1,6 @@
 name: build hx20 firmware
 
-on: [push, pull_request, workflow_dispatch]
+on: [push, workflow_dispatch]
 
 jobs:
   build:

.github/workflows/hx30.yml

@@ -1,14 +1,6 @@
 name: build hx30 firmware
 
-on:
-  push:
-    branches:
-      - hx3*
-      - hx20-hx30*
-  pull_request:
-    branches: 
-      - hx20-hx30
-  workflow_dispatch:
+on: [push, workflow_dispatch]
 
 jobs:
   build: