Added './' prefix to all directories in .astyleignore

This forces directory searching to not over-exclude files.

Also sorted the list, because it's nice.

.astyleignore

@@ -1,29 +1,29 @@
-BUILD
+./BUILD
-cmsis
+./cmsis
-features/cryptocell
+./components/802.15.4_RF
-features/mbedtls
+./components/TARGET_PSA/services/attestation/attestation.h
-features/lwipstack/lwip
+./components/TARGET_PSA/services/attestation/COMPONENT_PSA_SRV_IMPL/tfm_impl
-features/lwipstack/lwip-sys
+./components/TARGET_PSA/services/attestation/qcbor
-rtos/TARGET_CORTEX/rtx4
+./components/TARGET_PSA/TARGET_TFM
-features/storage/filesystem/littlefs/littlefs/
+./components/TARGET_PSA/TESTS
-features/storage/filesystem/fat/ChaN
+./features/cryptocell
-features/storage/FEATURE_STORAGE
+./features/FEATURE_BLE
-features/frameworks
+./features/frameworks
-features/FEATURE_BLE
+./features/lwipstack/lwip
-features/unsupported/
+./features/lwipstack/lwip-sys
-features/netsocket/emac-drivers
+./features/mbedtls
-hal/storage_abstraction
+./features/nanostack/coap-service
-TESTS/mbed_hal/trng/pithy
+./features/nanostack/sal-stack-nanostack
-features/nanostack/coap-service
+./features/nanostack/targets
-features/nanostack/sal-stack-nanostack
+./features/netsocket/emac-drivers
-features/nanostack/targets
+./features/storage/FEATURE_STORAGE
-rtos/TARGET_CORTEX/rtx5
+./features/storage/filesystem/fat/ChaN
-TESTS/mbed_hal/trng/pithy
+./features/storage/filesystem/littlefs/littlefs/
-targets
+./features/unsupported/
-components/802.15.4_RF
+./hal/storage_abstraction
-components/TARGET_PSA/TARGET_TFM
+./rtos/TARGET_CORTEX/rtx4
-tools
+./rtos/TARGET_CORTEX/rtx5
-components/TARGET_PSA/TESTS
+./targets
-components/TARGET_PSA/services/attestation/COMPONENT_PSA_SRV_IMPL/tfm_impl
+./TESTS/mbed_hal/trng/pithy
-components/TARGET_PSA/services/attestation/qcbor
+./TESTS/mbed_hal/trng/pithy
-components/TARGET_PSA/services/attestation/attestation.h
+./tools