tests: remove "gui" lock declarations

The fresh PLTUSERHOME created by `raco test --drdr` should avoid
the problems that made the lock necessary before.

original commit: 165f21a192f28746519c21cfd3b079ac73ff1b84

pkgs/gui-pkgs/gui-lib/mrlib/private/aligned-pasteboard/tests/actual-bigger.rkt

@@ -33,7 +33,3 @@
 (>= (send vpb1 get-aligned-min-height)
     (send vpb2 get-aligned-min-height)
     (snip-height es))
-
-(module+ test
-  (module config info
-    (define lock-name "gui")))

pkgs/gui-pkgs/gui-lib/mrlib/private/aligned-pasteboard/tests/test-snip-lib.rkt

@@ -126,7 +126,3 @@
   (send frame show #f))
 
 ;; (printf "tests done\n")
-
-(module+ test
-  (module config info
-    (define lock-name "gui")))

pkgs/gui-pkgs/gui-lib/mrlib/private/aligned-pasteboard/tests/test.rkt

@@ -145,7 +145,3 @@
 
 (send frame show #f)
 (printf "done\n")
-
-(module+ test
-  (module config info
-    (define lock-name "gui")))

pkgs/gui-pkgs/gui-lib/mrlib/private/aligned-pasteboard/tests/test2.rkt

@@ -112,7 +112,3 @@
 
 (send frame show #f)
 (printf "done\n")
-
-(module+ test
-  (module config info
-    (define lock-name "gui")))

pkgs/gui-pkgs/gui-test/framework/tests/main.rkt

@@ -121,5 +121,4 @@
 
 (module+ test
   (module config info
-    (define lock-name "gui")
     (define timeout 360)))