Android: unset QT_IM_MODULE when running Android tests

This environment variable might be set by some party (not quite sure
what, maybe the host OS), and when androidtestrunner passes QT_* vars
it might interfere with the input tests.

Pick-to: 6.8
Change-Id: I2a88c78535d6e3a809e8fcee8f8d752f91044a8c
Reviewed-by: Toni Saario <toni.saario@qt.io>

coin/instructions/coin_module_test_android_start_emulator.yaml

@@ -2,6 +2,11 @@ type: Group
 instructions:
   - type: Group
     instructions:
+      - type: EnvironmentVariable
+        # This variable interferes with Android input tests
+        # when forwarded by androidtestrunner.
+        variableName: QT_IM_MODULE
+        variableValue: ""
       - type: ExecuteCommand
         command: "{{.Env.ANDROID_EMULATOR_RUNNER}}"
         maxTimeInSeconds: 600