Replaced './' with '^' in .astyleignore file.

'^' matches start of line, which is what fgrep/grep use to properly ignore start of lines

.astyleignore

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