CI: Force building TextServer fallback

It's normally opt-in as the advanced one (CTL support) is the default,
but we need to build it to catch potential build issues.

.github/workflows/android_builds.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=android verbose=yes warnings=extra werror=yes --jobs=2
+  SCONSFLAGS: platform=android verbose=yes warnings=extra werror=yes --jobs=2 module_text_server_fb_enabled=yes
   SCONS_CACHE_LIMIT: 4096
 
 jobs:

.github/workflows/ios_builds.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=iphone verbose=yes warnings=extra werror=yes --jobs=2
+  SCONSFLAGS: platform=iphone verbose=yes warnings=extra werror=yes --jobs=2 module_text_server_fb_enabled=yes
   SCONS_CACHE_LIMIT: 4096
 
 jobs:

.github/workflows/linux_builds.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=linuxbsd verbose=yes warnings=extra werror=yes --jobs=2
+  SCONSFLAGS: platform=linuxbsd verbose=yes warnings=extra werror=yes --jobs=2 module_text_server_fb_enabled=yes
   SCONS_CACHE_LIMIT: 4096
 
 jobs:

.github/workflows/macos_builds.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=osx verbose=yes warnings=extra werror=yes --jobs=2
+  SCONSFLAGS: platform=osx verbose=yes warnings=extra werror=yes --jobs=2 module_text_server_fb_enabled=yes
   SCONS_CACHE_LIMIT: 4096
 
 jobs:

.github/workflows/windows_builds.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 # SCONS_CACHE for windows must be set in the build environment
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=windows verbose=yes warnings=all werror=yes --jobs=2
+  SCONSFLAGS: platform=windows verbose=yes warnings=all werror=yes --jobs=2 module_text_server_fb_enabled=yes
   SCONS_CACHE_MSVC_CONFIG: true
   SCONS_CACHE_LIMIT: 3072